There are a lot of mainstream apps that are not yet available on Windows Phone. And while I cringe at the thought of this, but unfortunately Talking Tomcat is also a very mainstream app. My feelings for this game aside, the app is one of the most popular ones on Android and iOS and has gained world wide recognition. There really isn't much to this game; it repeats what you say in a funny (subjective opinion) voice. More over you can beat the crap out of the cat and feed it milk. Sounds fun, no?
The game can be downloaded through the marketplace here. It's sized at 31MB and is free of cost.