A free gift is one for which the giver is not trying to get something in return[1], or one which does not cost the giver, such as when it is discount on resulting sales.[2]
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The phrase free lunch, in U. S. literature from about 1870 to 1920, refers to a tradition once common in saloons in many places in the United States. These establishments included a "free" lunch, varying from rudimentary to quite elaborate, with the purchase of at least one drink. These free lunches were typically worth far more than the price of a single drink. The saloon-keeper relied on the expectation that most customers would buy more than one drink, and that the practice would build patronage for other times of day.
The word "gift" is already suggesting that it is given to the receiver for free. Adding "free" before the word "gift" does not make any sense. You would not see the word "free free item".