Most red wigglers are bred for basically two things - fishing bait and composting, so ones you find for sale are generally for one of those two purposes. It doesn't seem like there's a large supply of them just as feeders and the ones you do find as feeders come from bait suppliers/distributors.
For instance, the night crawlers and red wigglers available in my area all come from the same source no matter where it is I go to purchase them (Wal-Mart, Petco, PetSmart, local pet shops, etc) and that source is a bait & tackle supplier.
As long as chemicals and additives have not been used on the worms they should be just fine for your frogs.
As far as starting a colony of red wigglers it's pretty easy. You can search youtube for a bunch of good videos on the subject. Search for "worm composting" and you'll find some good stuff on creating bins and such. This subject is mainly geared towards composting for gardens, but the worm husbandry is pretty much the same. The only difference is a frog owner is interested in keeping the worms, while a gardener is interested in keeping the worm poo lol






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