Balin and the Hollow Knight

When the world's oldest magician loses control of his magic, a boy and a frog step forward with a most unusual plan to save him. The hollow knight that - almost - comes to life through their efforts joins them in a quest to solve a dragon problem created by the wizard's magic gone awry. As their paths cross those of fantastical beings who do not necessarily have their best interests in mind, a witch, gnomes, an ogress and a troll all complicate their lives. About that frog. He says he was a prince. Will he ever become one again? Is he doomed to a life of eating flies? All this takes place in a fairytale world in which the unlikely events the principal characters must deal with include a mysterious (to them) modern convenience and an equally mysterious mythical artifact from the distant past.