You know those "turtle docks"? That would be better off in that so should your anole accidentally goes in than he can get out. I would also put sticks like you said. But good luck. Just remember to keep a close eye on it. I guess if you feed them both they may not bother each other? Iam more worried about parasites and bacteria. Plus the fact that all frogs are mildly toxic. If i were you id put a small whisper filter in the lil tub. Itll help remove waste. Still you do waterchanges and itll be like a fishtank(just dont add fish).