To my knowledge regular bait shop earthworms are fine, just clean them off and use a scissor to make them into more manageable pieces if needed.
Just avoid the funky stuff, like dyes or any other 'enhancements' they may do to them to make them 'better' for fishing.
The ones sold at Wal Mart should be just fine, I feed them to my clawed frogs, no issues and eaten with enthusiasm.
I would avoid red worms (red wrigglers) and stick with canadian nightcrawlers. I believe when cut red wrigglers secrete more 'snot' when threatened and I don't believe it's toxic to frogs it makes them much less appetizing and the frog may reject it.


			


					
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