Our pacman gets a dola worm (Pachnoda marginata) as a treat from time to time. They're a bit bigger than a waxworm. Crush the head first though. They've got nasty jaws.
I've read that large super worms can be dangerous for Pacmans because they can possibly chew their way through the frogs stomach. A very nastey thaught. I would assume it would be said the same for the dola worm.