I also have fish with frogs, I have got 4 bombina, they prefer water even more than ground, they are not big, they are very pretty, active during the day, easy to keep and, to prevent the question about their poisonousness
-if bred in captivity,- they are not dangerous. And more, I'd like to add to my aqua terrarium common tree frogs - Hyla arborea or cinerea because I adore them, specially arborea, they can live till 25 years old(unfortunately cinerea are more fragile, they don't live long).These frogs do not do any harm to fish
. All of them are compatible.