From the Super Mario Wiki
A Clawdaddy is a foam-covered crab that inhabits the jungles of Yoshi's Island. They take three Eggs or a Ground Pound to be defeated. Clawdaddies rush towards a target once the target is spotted, then enlarge one of its claws before lunging and pinching, or spinning it around.
However, Clawdaddies reappear in Yoshi's New Island, this time on Egg Island. Here the foam on a Clawdaddy's body can be removed by licking it, although this otherwise has no effect. A giant Clawdaddy, King Clawdaddy, appears as the boss of World 3.
They are set to reappear in Yoshi's Woolly World, now stylized and resembling polka-dotted purses.
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