I wouldn’t have characterized The Princess and the Frog that way. In that movie, the protagonists learn to be happy despite being frogs, not because they are frogs. Being frogs throws them together and forces them to get to know one another, but their happy ending comes once they become human again (and the point of the movie is about working tirelessly to achieve their dreams, not removing themselves from society)

Edit: why yes, I do have small children and spend far too much time analyzing the themes of animated movies; why do you ask?