Squiggler

A Squiggler is a miniature Wiggler that first appears in New Super Mario Bros.. With three body segments and a head about twice the size as the other segments with a sprout on its head, this tiny Wiggler crawls around the perimeter of pipes. Unlike regular Wigglers, they can be defeated by stomping them or by using a fireball. Squigglers are only seen in World 7-A.

A single Squiggler appears in Mario & Luigi: Bowser's Inside Story in Dimble Wood. Bowser meets with it and the Squiggler seems friendly. However, Bowser was quite rude to it saying vegetables are gross and that meat is better.