We've found that some of our froglets just don't like the cricket legs. We will feed them bits of night crawlers until they get a bit larger. You could try that and see if he keeps that down. If he regurges the worm.....time for a vet.
It doesn't take food from forsepts and I immediately soaked the little guy/girl afterwards and he/she pooped. Poop looked normal. Its stressed. Right now and don't know if it will take food. What should I do?