Um, I'm not an expert, but sources I found on the internet said that White's Tree Frog, Oriental Firebelly Toads, and Pacman frogs are good for beginners. Some sites say that African Clawed Frogs are good for beginners, but those are illegal in some states, so it depends on where you live. African Dwarf Frogs are also sometimes called beginner frogs, but I have reasons to doubt that, as so many are currently infected with chytrid. I hear that most die shortly after purchase.

You can probably do better research than me on the subject, I am by no means an expert, but I thought you'd want at least ONE response to your post.