I think Wiggler is the name of the caterpillar enemy from Super Mario World.
One of the levels in New Super Mario Bros. Wii involves an underground cave system where giant wigglers march around at all angles. You are forced to dodge them in areas in order to get ahead and, in other areas, you are forced to jump off them to reach platforms.
An underground cave system criss-crossed by purple worm tracks (or other delvers, such as delvers, bulettes, anhkegs, etc) and still inhabited by those creatures could serve as an unusual venue. In addition to dodging the diggers, PCs would have to utilize their newly built tunnels to get around.