An LDS couple in Arizona has created the LDS Animated app that animates Primary songs with the lyrics appearing along the bottom of the screen.
Each song is animated with different scenes or stories and scrolls through the lyrics in a sing-along style. The app includes some songs for free and others for purchase. Each of the songs are available in English, Spanish, French, and Portuguese.
Learn more about the app in the article “BYU animation grad and wife create app to help children learn Primary songs.”