Personally, if you're only buying the frogs to put in with the bettas, I would not do it.
Putting bettas with ADFs doesn't always work out. I tried to combine my two tanks once and it just didn't happen, Robert hated the frogs. If they don't get along, will you be okay with housing the frogs separately? Would you be happy to do that? If not, then I'd look for a different tankmate.
Robert Falcon Scott - Red salamander HM plakat
Passed on- Friedrich "Freedy"
Four African Dwarf Frogs - Dorkus, Sporkus, Baron(ess), and Bubbles!