Imomushi

Imomushi (イモムシ), known in English as Caterpillars, are enemies in Wario Land 4 that only appear in the level Wildflower Fields. They are harmless green caterpillars that can't hurt Wario and simply move back and forth very slowly. Wario is able to defeat them with any of his attacks, a defeated Inomushi will leave a small silver Coin. Like most enemies, they can also be grabbed and thrown when they are stunned. Imomushi are among the weakest enemies of the game, their low speed makes them even weaker than the Marumen.

Their name is simply the Japanese word for caterpillar.