I just started keeping ADFs. Absolutely no problem with 2 in a 10 g tank. I've got 3 in a 10g along with a betta, 3 emerald cories and 3 wild type guppies. The only thing is to make sure the frogs get their share of the food or they will starve. I feed the fish first and then use a feeding syringe to feed the frogs thawed (with tank water) frozen blood worms or brine shrimp.
I know that there are people who keep clawed frogs with fish but it's definately trickier and, personally, I wouldn't do it.
One important note, when you go to buy the frogs, check their FRONT feet. Dwarfs will have webbed feet while clawed won't.