Clawgrip

Clawgrip is a giant rock throwing crab that inhabits Subcon in Super Mario Bros 2. Hailing from the 5th world, he acts as an end boss much like the Mousers do. In the original Doki Doki Panic game Clawgrip did not exist and his place was filled in by a third Mouser. But in turning the game to Super Mario Bros. 2, the programmers added Clawgrip.