At one point I had over 20 tanks going.

African frogs, absolutely. Not a LOT available in the hobby from mainland Africa. But they are quite a few tree frogs and reed frogs from Madagascar available, as well as what I keep, mantellas, the old world dart frogs

Even in a 180, keeping frogs and geckos is a monster challenge. First, they would need to be from the same locale. Second, they have different care requirements. Third, most people do it wrong, they pick two arboreal species. If you went with an arboreal gecko, like a day gecko and a mostly terrestrial frog or a toad, it becomes a bit more feasible. But still a challenge for even the most skilled expert. There are so many more items I could point out about how difficult it is to successfully pull off.