IMO/E it's not a great idea. Your risking the betta harming the frogs or vise versa. Many of us have seen bettas bothering the frogs, but what you hear less about is the frogs bothering the betta, which is definitely a possibility. I've had frogs swallowing limbs of other frogs during feedings, and also have had brutal knock down drag out fights between my males that I would not want a betta around for. Another issue I had when keeping ADF's with fish is trying to get them enough food without overfeeding the fish. You will need to target feed the frogs since they don't see well and won't be able to compete for food with fish. That part seems easy, but keeping the betta out of it can be tricky. I ended up with overstuffed fish because they kept darting in and taking from the frogs, even if I was delivering the food right to the tip of their noses. For years now I've kept my frogs in a species only tank and that what I recommend.
However you decide to keep them, I recommend for ADF's you set the temp to 80. Their skin is very sensitive and prone to infection if damaged, so inspect any decor you might be adding for rough or sharp edges. Live plants are best. They will spend a lot of time in the live plants but IME they care not for fakes, and they are more likely to have pokeys. A sturdy floating/tall plant (stem plants like pennywort work great) is a good idea so they can easily rest near the surface when needed. A sponge filter is a great idea. I've had frogs get stuck in the intake of a HOB filter and could not be removed. Nasty situation. Feed them only frog and tadpole bites (look for HBH and/or Reptomin brands) along with meaty foods like frozen bloodworms and brine shrimp. If you keep them in a species only tank, you don't need to target feed, but feed in the same place every day so they know right where to go, and less is lost/wasted, creating a lot less clean up for you. Always avoid freeze dried foods. Using a small feeding dish is great. If you can, get 2 females for each male. During their prime there will be a whole lotta mating going on, and I'm not sure if you've seen it, it's called amplexus, it's very strenuous on the female. To sex them, look for a little bump under the armpit only the males have. All males or all females if fine as well.