Worms are a no go...

[Baelari]

Lump refused earthworms for 3 days before he decided he was hungry enough to eat them. He seems to prefer crickets though, and will only take an earthworm if he hasn't eaten in a while, and then only if it's covered in vitamin powder and writhing.

[LilyPad]

They were quite fresh and wiggly, but all four hated them. It's no big deal, I just thought it would be fun!

[artes]

I wouldn't worry about the worms. If nothing else, they'll help get some biological decomposition stuff going in your dirt, which will help decompose frog poop. And if the worms surface, the frogs might be all "Ooo!" /pounce.

[LilyPad]

I figured it would be okay, I was worried about them dying and rotting and what that would cause, but if that's fine, I'm okay with it!! I will be switching vivs in a few weeks anyways (hopefully)

[John]

Tree frogs rarely encounter earthworms so they don't generally eat them. This is pretty normal. Desert toads and toads from hot arid places in the southern US have the same problem - they never encounter earthworms and either don't eat them or have a hard time trying to deal with them.

[artes]

If they rot, that just means more biological activity in your soil.

Edit:
My college degree -might- have been in soils. Cough.