Clawgrip, incorrectly spelled Clawglip in the credits, is a crab. He is a boss in Super Mario Bros. 2 and one of Wart's minions.
Clawgrip was fought in World 5-3, but Mario, Luigi, Peach, and Toad defeated him. To destroy him, the player must pick up the rocks he throws and throw them back at him. He takes five hits.