[TOMT] [early 80’s] [tv show] A group of kids running from worm-like monsters. Possibly set in American Southwest.

This was a tv show (possibly a movie but I’m almost certain a tv show). All I remember is a group of kids running and hiding from these monsters who looked like piles of worms. Think a scary version of the fry guys from the old McDonalds ads. The settings I remember were desert-like similar to the Grand Canyon etc. At one point I believe they hid underground. That’s all I can recall but it scared the crap out of me as a kid. Would have been around 1985.