I've heard of claims that earthworms can have nematodes. Not sure if that means a T will automatically get infested by them but if it does there is nothing you can do about it and it will eventually die.
Forgot to mention that I've tried it myself until I've heard the above. Nothing bad came of it but it surely isn't worth the risk until one knows more about it.
Most picky Ts won't accept them. My 5" rosea won't ahve anytyhing to do with them, while my 3.5" will eat anything that moves, including my fingers.
Clean up is messy afterwards. The risk of parasites is too great in my opinion.
If you're friend is out of crickets, and needs to feed his T, offer them a pea. Seriously, try it out sometimes. A green pea. Make sure it has no pesticides on it, and all that junk. Caned one's are best. Just put it in front of the T, and watch. It might take awhile, but 80% of Ts will accept it.
Well one thing they might get out of a pea for sure is water. But what else? Dunno and I don't think it's a good idea to try it with a diet of only peas. I don't think it's a long stretch of the imagination to think that they can digest greenery.
Ofcourse a colony feeder will have some undigested food in him, most often fruit, but maybe that's exactly the stuff a T poops out a while later? :?
i think the nightcrawlers available in pet stores come from the same sources as those in bait shops, which is usually from crop fields, so yes pesticides are often an issue. they are just re-packaged and over-priced in the pet stores to make them look like "official" feeders.