Are there any good mobile apps for teaching kids mandarin?

The best way to learn Chinese is through Chinese Nursery Rhymes. There are alot of nursery rhymes available in phone apps. e.g. https://itunes.apple.com/us/app/learn-to-sing-chinese-nursery/id570201844?mt=8, https://itunes.apple.com/us/app/chinese-nursery-rhymes-lullabies/id957152498?mt=8 For word recognition, you can use apps such as http://www.theworldofchinese.com/2013/04/ocr-app-faceoff-can-your-phone-read-chinese/