yes it is ok to poke his mouth gently, i emphasize the word gently, just rub his mouth gently, most will grab whatever is it, that is one of the ways to tong train them.
your frog doesn't look skinny or that he needs some additional nutrition. whatever amount he eats right now is obviously enough, he doesn't need more, they are pretty good in regulating their food intake, so as long as he is eating and eating healthy food, no need to worry.
just don't annoy him and he will be just fine.
you can give a f/t fuzzy if you want, I never advise on feeding live.





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, just rub his mouth gently, most will grab whatever is it, that is one of the ways to tong train them.
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