Even canned refried beans are pretty good. That was the first semi-solid thing I ate when I had oral surgery to have my wisdom teeth extracted. They're soft, flavorful and have lots of protein, so I'd definitely recommend them for someone who has had oral surgery.
Sometimes, kids will eat refried beans when they won't touch any other kinds, and this may be a good way to introduce them to beans in general.
I really like refried black beans and also bean dip. It combines the best of both worlds-- refried beans and cheese dip. Refried black beans are great with grilled chicken and pineapple.