i think they could live together for quite a while since leopard frogs are great at avoiding being caught but itd most likely be a matter of time. i think if you set up a basking area you might be able to pull off an anole and no biggie if it doesnt work because theyre like 5$ intended as feeders. i think a similar sized newt or salamander species could also work fine. maybe you could pull off a tokay gecko. i think a lesser siren would work absolutely fine. all of these are still very unideal.