Taprisiots are a fictional species in Frank Herbert's science fiction novels, Whipping Star and The Dosadi Experiment.
Taprisiots (generally called 'Tappys' by humans) appear to be stubby chunks of wood, almost like logs with their branches broken off. Their value to other sentients is that they can communicate directly with each other telepathically, and can create telepathic communications channels between other sentients with their mediation. They sell their services as communications channels, and have become indispensable to the workings of the pan-sentiency.
Among other users, agents of the Bureau of Sabotage are sent out on especially dangerous missions with 'Taprisiot monitors': a Taprisiot maintains a telepathic link to the agent, and at the moment of the agent's death, the entire circumstance and contents of the agent's conscious mind can be made available for study.
Characters in both Whipping Star and The Dosadi Experiment speculate that Taprisiots are in some sense immature cousins of Calebans, who have far greater access to the realm that the Taprisiots use for telepathy. Caleban interaction with sentients is through contracts to provide jump-doors and other, more specific, services.