Haha! YAY for froggy pic spam! Love it!!!
Lidzu - I agree with Watty, from what I can see in the pic, he looks healthy to me! Cute little bugger!
Watty - I feel bad for your friend and her 55g! It's also really hard to treat for things like worms without killing a frog, they can be so sensitive to medications. . . *sigh* But really happy that you're around to give him a new AND GOOD home, lol! As far as QT, if she's had him for longer than 3 months, Chytrid shouldn't be a concern. For the most part, any of the worms or other illnesses that can affect fish do NOT affect frogs (and vice versa). These things, especially parasites, have their own hosts that they can't live without - so your main concern here would be that the frog would be a temporary carrier, perhaps carrying some remnant of the illness or parasite in on it's skin or inside of it's intestine (likely in the case of worms likely to have been ingested by the frog). Your best bet would be to keep him in a fishless QT for a period of at least 1 month - I'd give it 6-8 weeks to be sure, because I like to err on the side of caution. After about a month, even the most difficult of fish nasties will die off without a host (fish) to live on. The same QT process should be done with anything coming into a tank - even snails and plants if they have lived with fish in their recent past. Glad you're willing and able to give this little one a new home!
Your newbies (and the old ones, of course) are looking beautiful and fit! I wouldn't worry too much about the little one's feet. We lump several species into the common name of African Dwarf Frog, it could be that he's a slightly different frog from the ones you have, or it could be just a natural genetic variation, but either way I'm sure he'll thrive. My first frog was in a filter accident in the first month I had her, and the webbing on one of her back fins was ripped. She carried on as if nothing had happened until she died recently - the injured foot healed up, but never repaired itself, but also didn't slow her down a bit!
Good luck, both of you, on all of the new arrivals!