The film's plot concerns a prince named Naveen from the land of Maldonia, who is transformed into a frog by the evil scheming voodoo magician Dr. Facilier . The frog prince mistakes a girl named Tiana for a princess and has her kiss him to break the spell. The kiss does not break the spell, but instead turns Tiana into a frog as well. Together, the two of them must reach the good voodoo queen of the deepest, darkest part of the Bayou, Mama Odie , while befriending a trumpet-playing alligator Louis and a hopelessly romantic Cajun firefly named Ray along the way.
Source from Wikipeida