I've always used Nightcrawlers (specifically Lumbricus terrestris) so I have no personal experience with Red Wigglers. As far as I've read they're safe for frogs assuming they've been raised in a safe environment, but they are foul tasting and not all frogs will accept them. They're available as feeders at Red Wigglers (45-55 count) | Josh's Frogs so I'd tend to assume they're suitable as feeders or they would have run into heaps of problems by now.

Quote Originally Posted by jeromeetabuzo View Post
do you mean mealworms??
Mealworms are the larval stage of the beetle Tenebrio molitor. The OP said he had Eisenia fetida.