Apparently picky WTF

[UncleChester]

Worms have a secretion that some amphibians find very distasteful. This seems to be dependent on both the species of worm and on the individual frog. One of my Gray Treefrogs, Hyla versicolor,​ will mow down Canadian Nightcrawlers like it's lobster at a $20 buffet, the other will pull them out of his mouth like you've described and then turn away in disgust. He can sometimes be convinced to eat the smaller lighter coloured variety that turn up in my worm collecting areas though.

My American Green Treefrog, Hyla cinerea, appears to be on a one frog mission to devour all earthworms from the planet.

You can try chopping them up into smaller bits. My fussy frog can sometimes be tricked into swallowing a piece before he realizes he had already set out not to eat any.

[HerpDerp]

My pacman frog used to do the same thing with wigglers. My white's that I have now wont even go for cut up night crawlers at all. He backs away from them like he's afraid lol. So now I have a tub of night crawlers that I have no use for. I think some frogs get used to eating just crickets so it's hard to get them to eat anything else.