A famous version of this story was told by the Brothers Grimm. You can read it and look at some beautiful illustrations at this site . Make story maps to show the differences. You can read about a gentler princess in The Frog Prince , at this site . There is even a version of this story from China - The Frog Who Became an Emperor .
Some stories swap the roles of the characters.
Read about a prince who married a frog at this site , this site and this site . Now choose or make up the characters and events you like best, and write your own version, as a story to make a slide show or as a play to perform for the class.