Attack of the Beast Creatures (1985)
Where to start. It's a horror movie about a stranded bunch of community theater actors being attacked by razor-toothed kachina dolls. Literally they're holding the dolls to their faces and bodies like they're graduates of the Bela Lugosi Attacked By Octopus Acting School.
If there ever was a movie for Rifftrax to go after, it's THIS one!