Frog Dude

Frog Dude is a cancelled platformer that was in development by Twilight for Genesis / Mega Drive in 1993. The game was never officially announced but, in 2014, Gamesthatwerent contacted Andy Swann, the lead programmer of Frog Dude, which shared a short playable demo of the game.

The main character was a strange man who used a mace to attack and could transform himself into a long-tongued frog. There is nothing to interact with, no enemies to fight, and no sound effects or music. However, at least a nice cut-scene welcomes players at the beginning of the prototype.

Source: TheGamesDB