Flophopper

Flophoppers are bug-like species of enemies introduced in Super Mario 3D Land. They are sub-species of Swaphopper, but unlike their cousins, they do not attack by using gravity tactics. Instead, they attack by moving around in a set area by flipping themselves around, much like a Bramball. They cannot be jumped on while their spiked helmet is exposed, so Mario must wait until they flip and their underside is exposed, a vulnerability shared with Swaphoppers. They can also be defeated by Fire Mario, Boomerang Mario or Tanooki Mario.

Trivia

 * Their name is a pun of flip-flop, referencing their movements, and "grasshopper".