Watch Mr. Frog for Free: How to Stream the Movie Online at 123Movies. . A normal class, ordinary children and a regular school teacher. Or not. The lives of the children in Mr Frans' class are turned upside down when they discover that he sometimes turns into a frog. And Sita is so fond of her teacher that she wants to protect him at all costs from all those dangerous animals... Based on the novel by bestselling Dutch author Paul van Loon.