Songs for Sapplings has a catechism set to music. That’s a great resource, too.
If you lean Presbyterian, there are a LOT of resources available: Catechism for Small Children, Big Truths for Little Kids, The Westminster Shorter Catechism, Teaching Hearts, Training Minds (those are all based on the Westminster) and there is The Heidleberg Catechism and Comforting Hearts, Training Minds (a devotional based on the Heidleberg). If you are Baptist, there are still plenty of catechisms, but not as many resources aimed for children. There is a book called Teaching Truth, Training Hearts that is FULL of Baptist catechisms.
There is a Lutheran Catechism and Wesley did an edited version of the Westminster if you lean more Wesleyan.