Calmenson, Stephanie. The Frog Principal.   E Calmenson
After the principal of P.S. 88 is turned into a frog by a bumbling magician, the frog bargains for the chance to act as principal until Mr. Bundy returns from his "family emergency."

Grimm, Jacob. The Frog Prince.   J 398.0943 G

Grimm, Jacob.  The Frog Prince : or Iron Henry.  J 398.0943 G

Isele, Elizabeth. The Frog Princess.  J 398.0947 I
Forced to marry an ugly frog, the youngest son of the Czar is astounded to learn that the frog is really the beautiful princess Vasilisa the Wise.

McKay, Sindy. The Frog Prince.  Reader 2 M
As payment for retrieving the princess's ball, the frog exacts a promise which the princess is reluctant to fulfill. (We Both read series)

Ormerod, Jan. The Frog Prince. J 398.0943 G
As payment for retrieving the princess's ball, the frog exacts a promise which the princess is reluctant to fulfill.

Scieszka, Jon. The Frog Prince, Continued.    E Scieszka
After the frog turns into a prince, he and the Princess do not live happily ever after and the Prince decides to look for a witch to help him remedy the situation.

Tarcov, Edith. The Frog Prince. J 398.0943 G
Angry at being forced to keep her promise to a frog,  the princess finally resorts to violent action with unexpected results.

Vesey, A.  The Princess and the Frog.  E Vesey
A princess waits impatiently for the frog she brings into the palace to turn into a prince--but he seems only to grow fat and bossy.

Zemach, Harve.   The Princess and Froggie.  E Zemach
Whenever the princess's problems seem insoluble, Froggie helps her out of her difficulties.