Crabble

Crabbles are hermit-crab-like creatures in Yoshi's Island DS. If you hit them with eggs or Koopa shells they change color. When you hit them three times, they pop. They walk on platforms and can walk sideways and even upside down. They act much like Clawdaddies and might have been inspired by the Sidesteppers of the first Mario game, since they change between the three colors of blue, green, and red.