The banana is an unimplemented item in Stranded Deep. Whether it will ever be implemented as a consumable item has yet to be announced; should it be added to a future update, it is to act as the third type of naturally-generated food source (after coconuts and potatoes) found on islands.
While bananas do not exist in a physical form in the game, evidence of its planned implementation have been found. Unlike the fishing rod, the banana has a near-complete, if not finished, texture. Coding for both ripe and unripe bananas have also been discovered in the game files.