The Frog Prince adapted from the retelling by the Brothers Grimm by Paul Galdone

I like Mr. Galdone's illustrations.  He has retold many of the Brothers Grimm tales and other folktales.
A princess loses her precious gold ball in a deep well where a frog inhabits.  He agrees to fetch it for her if she promises to allow him to be her companion.  The princess hastily agrees but once she has the ball, she leaves, not fulfilling her promise.  The frog follows her into the palace where her father enforces her to keep her promise. 
She is quite disgusted with her companion but finds a pleasant surprise at the end.
In this version, she does not kiss the frog.
-Borrowed from the library.