You might find some differing opinions on mixing the first three species, but I'm not sure what would possess someone to think it's a good idea to put a tropical frog like a red-yes in with those first three North American species. Different climates! I don't know much about the white lipped, except they get huge as mentioned. That alone should put them in a cage of their own.
I have read people having success with communal housing for Grays, Hyla versicolor, and American Greens, Hyla cinerea (for the record mine are housed seperately). Also Grays with Barkers, Hyla gratiosa. Barkers and American Greens will also readily interbreed in the wild, so ehh. There's no way I'd put them all together in a 40 gallon though, it would have to be a monster tank before I considered trying it. Like big enough to fit in comfortable myself.
And yes, feed more frequently. Especially if they're all young. But less mealworms, they're not really an awesome food source.
Knowing you, I'm sure you mean 20gallon tanks, but thought I'd clarify.





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