There's no way around it. If you have a child who's already in love with the movie, that child will want to have The Princess and the Frog on her Nintendo Wii. You can take comfort in knowing that the overall game isn't bad at all. A good portion of the 20+ mini-games are rather fun when played with four human players.
Additionally, the overall production value, from the graphics to the sound, matches the movie perfectly. This is one of the few times when a game with a young target audience does the job. If you purchase The Princess and the Frog for the Wii, you won't suffer from buyer's remorse.