Ok, I call them Cuban browns, I think most people do. I know they have them in the Bahamas, too, but I don't *think* they're originally from there and I can't rememeber ever seeing any of those anywhere I've been. But I've never been to Bimini or Nassau, where they'd most likely be, anyway. Anyway, that'd be your best bet for an anole in a tank, it's about the least arboreal. They usually don't climb too high.
Anyway, in that case, I think it can possibly be done, but I think that if your frog seems down, something isn't working for it, and I'm guessing the temps. I think that's good for a basking temp, but I think that's too hot for greys. I know that greys don't live in South Florida, they stop around the upper middle, so that leads me to believe they can't take it too hot. Or too humid, either. Anyhow, any readings on your humidity yet? If you don't have a guage, they're pretty cheap at any pet stores and work really well. I haven't had them long, but I'm particular about humidity and need it between certain levels for myself, lol. And my dad has a big hygrometer and other stuff in the den that I'd take into my room when I needed to make measurements. Anyway, I recommend you get something to figure it out. It actually changes more than I thought.. Usually, my tanks are between 70-75%, although it's a bit high. Last week, though, I went in my room--before even misting that day--and the tanks were at 90% and 94% (the sand lowers the humidity, and that's what I had in the 90% tank).
Anyway, 10-gallons are cheap and I'd seriously consider getting one for your anole, and for your new froglets, too. Then, if you figure out what's wrong with the grey, you could put another in the 20. Also, is your anole a male or female? Those males are pretty aggressive! I have one that did territorial displays against me daily until I started to feed it regularly and now it likes me, lol. But those things can be mean! They do need a lot of space, too.
Also, are your animals captive bred or wild caught? I'll assume that the anole is a wild one, but I wouldn't know if the temperament improves much for captive ones. And you're not going to keep the toadlets or froglets in there, right?
Anyway, I really hope someone reads this because I can't really help you more. So I'm waiting, lol! Well, good luck.. hope everything works out.
But about the toadlets, many species won't eat until a few weeks after their tail is absorbed. And what size is it? Ants may be too small. I have some tree froglets now that eat ants, but I had some leos and they would only take in things the size of crickets. They're only a few weeks old, and they're already on medium-large crix... But those all ate the day after they morphed. RETFs supposedly take three weeks. it all depends.