Honestly, I would not, in a five gallon. Speaking from my own limited experience, African dwarf frogs are a little bit delicate, and will grow too big to peacefully share a tank with a betta fish.
Maybe someone with more experience will contradict this? But I feel like the betta will stuff himself with the frog's food, and maybe harass the frog as well in such a small space. My ADF at least is probably the only thing in my tanks that swim even more slowly than my betta, and if they shared a tank he would definitely be bullied.
Maybe someone with more experience will contradict this? But I feel like the betta will stuff himself with the frog's food, and maybe harass the frog as well in such a small space. My ADF at least is probably the only thing in my tanks that swim even more slowly than my betta, and if they shared a tank he would definitely be bullied.