A student I work with developed this app for iOS, called Swamp Mess. It's a simple memory game, but fun to play. My 2 year old son LOVES it. And the background "music" is bullfrogs, so its much less annoying than other games he plays... :)
https://itunes.apple.com/us/app/swamp-mess/id1082174609?ls=1&mt=8
https://itunes.apple.com/us/app/swamp-mess/id1082174609?ls=1&mt=8
