I think the worms may take a bit longer to digest. Our froglets eat every other night when earthworms are on the menu whereas the juvies & adults will eat them no matter what.
Is he/she eating a day or two later? It could also just be he/she is a picky eater. Some of ours are and will refuse the food items they like the least because they seem to have learned that we will offer them other stuff if they won't eat the cricket or worm offered originally.