I found my fantasy frog dead today, it was unexpected. The thing is, my leopard gecko was just diagnosed with having Cryptosporidiosis, a usually fatal parasitic infection of the small intestines. I haven't come across anything on the internet about frogs having this parasite (except about African Clawed frogs in labs). No idea if anyone has any insight. I thought crypto was pretty species specific(according to the species of crypto) and wouldn't jump to amphibs. I also have two African bullfrogs, they seem fine.
The only things I've noticed were that my fantasy seemed a little pale yesterday, and he has been very active the last two weeks (in terms of moving around the tank).