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Frogs feature prominently in folklore and fairy tales in many cultures, such as the story of The Frog Prince, up to modern-day popular culture. Pop culture tends to portray frogs and toads as benign, but ugly, and often clumsy, but also with hidden talents. David P. Badger's Frogs (S.l.: Voyageur Press, 2001) includes chapters on "frogs in popular culture, their physical characteristics and behavior, and environmental challenges."[1]
Michigan J. Frog, featured in a Warner Brothers cartoon, will only perform his singing and dancing routine for his owner. Once another person looks at him, he will return to a frog-like pose, and begin calling. The Frog Prince is a fairytale of a frog who turns into a handsome prince once kissed. Slippy Toad, a character from the Star Fox series of video games, is a talented mechanic, but mediocre pilot, who often ends up needing to be rescued by his team mates. Kermit the Frog, on the other hand, is a conscientious and disciplined character of Sesame Street and The Muppet Show; while openly friendly and greatly talented, he is often portrayed as cringing at the fanciful behaviour of more flamboyant characters.
The theme of transformation of and into frogs also features prominently, as in The Frog Prince, but also in fantasy settings such as in the Final Fantasy and Chrono Trigger video games that sometimes include magic spells that turn people into frogs.
Frogs are popular subjects of experimentation, as in scientific demonstrations of nerve action and diamagnetism, and cruelty, as in video games such as Frogger and Ribbit King.
Frogs are also used as symbols of disgust due to their moist skin that can be perceived as slimy, and the sometimes repugnant secretions, especially of toads. In the Bible (Exodus 8:6) the Second Plague is one of frogs is sent upon Egypt; this was a deliberate irony by the God of Moses, as the Egyptians saw frogs as a symbol of life and worshiped a frog-goddess. Later, frogs are also associated with unclean spirits in Revelations 16:13.[2]
Frogs are eaten, notably in France. One dish is known as cuisses de grenouille, frogs' legs, and although it is not especially common, it is taken as indicative of French cuisine. Thus frogs are sometimes used to represent French people.
Frogs fall from the sky in various urban myths. This may derive from real incidents when frogs are picked up by a tornado, or when a sudden migration of frogs happens overnight, which can also happen with fish.
In medieval Europe the frog was a symbol of the devil due to the Catholic church associating the frog as one of the animals witches use as a familiar.[3]
The behavior of frogs illustrating nonaction is typically expressed in the story of the boiling frog: put a frog in boiling water and it will jump out, but put it in cold water and slowly heat it, and it will not notice the danger and will be boiled alive. The story has been repeated numerous times to highlight the importance of unnoticed gradual changes.
The story was based on nineteenth century experiments in which frogs were shown to stay in heating water as long as it was heated very slowly.[4] The original 1872 experiment was conducted by A. Heinzmann and this was corroborated in 1875 by Fratscher.[5] The validity of the experiments is disputed. Professor Douglas Melton, Harvard University Biology Department, says: "If you put a frog in boiling water, it won't jump out. It will die. If you put it in cold water, it will jump before it gets hot -- they don't sit still for you."[6]
It is commonly believed that physical contact with a toad can cause warts on humans. Warts are, in actuality, caused by a human internal viral infection; thus, a toad could not possibly cause a wart. The parotoid glands, which toads use to secrete toxins, are often mistaken for warts.
To the Egyptians, the frog was a symbol of life and fertility, since millions of them were born after the annual inundation of the Nile, which brought fertility to the otherwise barren lands. Consequently, in Egyptian mythology, there began to be a frog-goddess, who represented fertility, named Heget (also Heqet, Heket), meaning frog. Heget was usually depicted as a frog, or a woman with a frog's head, or more rarely as a frog on the end of a phallus to explicitly indicate her association with fertility.[2]
The Ogdoad are the eight deities worshipped in Hermopolis. They were arranged in four male-female pairs, with the males associated with frogs, and the females with snakes
Hapy, was a deification of the annual flood of the Nile River, in Egyptian mythology, which deposited rich silt on the banks, allowing the Egyptians to grow crops. In Lower Egypt, he was adorned with papyrus plants, and attended by frogs, present in the region, and symbols of it.
The Biblical plague of frogs sent to curse ancient Egypt, like the nature of the other plagues, was intended to show the sovereignty of the God of Moses over the gods of Egypt.
The Greeks and Romans associated frogs with fertility and harmony, and with licentiousness in association with Aphrodite.[2]
The frog represents the lunar yin, and the Frog spirit Ch'ing-Wa Sheng is associated with healing and good fortune in business, although a frog in a well is symbolic of a person lacking in understanding and vision.[2]
To Vietnamese people, toad is the uncle of the Sky. According to a Vietnamese ancient story, whenever toads grind their teeth, it is going to rain.
In Scotland the frog is seen as an item of luck. Households often keep stone frogs in their gardens and they are often given as house warming presents. The associations are believed to date back to Pictish times.
The Moche people of ancient Peru worshipped animals and often depicted toads in their art.[7]
In East Lancashire the frog is also seen as an item of luck (as in the Scottish entry above). In this region ornamental frogs are often given as wedding presents, and in addition are seen as an aid to fertility and virility. This association is believed to date back to medieval times.
Frogs have been featured in studies of diamagnetism in biological organisms. As such those organisms were submitted to a large magnetic field (several teslas) produced by a Bitter electromagnet and found levitating due to the diamagnetic features of water (as well as any other substance that is). Apparently a frog was used for the following reason as described by a researcher: "We were amazed to find out that 90% of our colleagues did not believe that we were not joking that water can levitate. It became obvious to us that it was important to make scientists (as well as non-scientists) aware of the phenomenon. We levitated a live frog and other not-very-scientific objects because of their obvious appeal to a broader audience and in the hope that researchers from various disciplines, not only physicists, would never ever forget this often neglected force and the opportunities it offers."[10] Frog levitation plays an important part in the novel Science Fair by Dave Barry and Ridley Pearson. Frog levitation also guaranteed the 2000 IgNobel prize in physics to Michael Berry and to 2010 Nobel Laureate in Physics Andre Geim. [11]