Well, my hermits are not fond of water and the frogs are. The hermits burrow in eco earth. The frogs have pebbles, rocks, some grass, some eco earth plus their driftwood log goes over the water and I doubt the hermits would want to end up on top of a frog. Both have humidity but the hermits don't like swimming LOL. They'd probably get along but the crabs are good sized and I don't want to find anyone hurt, fighting or arguing. It just occurred to me the hermits might like to chase a cricket, I'll have to give them one. Anyway, I guess its best if I keep them separately, I just wonder if they'd get along. I know turtles were banned due to salmonella but I never got it, I washed my hands. Sure miss those turtles though. But, how many hermits and FB's do you house together and what size is your tank? What do you feed your hermits and frogs? Just curious..I bought a new batch of crickets today for frogs and hermits will get boiled chicken, fruit, and veggies.