Despite the best care, some just won't make it. If you have some that have fully morphed, I would separate them from the adults and set them up in a terrestrial setup with lots of cool branches, leafy greens and a small water dish for their soaking pleasure. Keep offering them the fruit flies and dust them with supplements if you can. For the tadpoles, make sure the water is just enough to cover them and no more. If all four legs have sprouted, they may not eat until their tail is absorbed. If they only have back legs, offer them fish flakes or algae wafers. If you see poop, they are eating, whether you see them chow down or not. If you do have a large amount of frogs that are suddenly doing well, I'm not exactly sure what you could do with all of them. Perhaps local schools would appreciate a classroom pet??