I dont have an iphone (I cant use them ) but Dan has and he got this hilarious app for it
http://itunes.apple.com/app/sumobooth-talking-photo/id413623969?mt=8

You take a pic of a person, so he did Izzy, then it makes them look like a sumo, and when they say a word it repeats it back and the mouth moves...well it has been entertaining Izzy for ages as she goes through all the words she knows!

Well worth it if you have an iphone!