I have an app that takes a sprite and startes an animation when clicked. Is there a way to check if the animation is already running and what frame it is on? For example, when clicked, I display a message that it is on frame 10 out of 15?

Yep, there are the GetSpriteCurrentFrame() and the GetSpritePlaying() commands.

What documentation is there where I could have found that myself?

http://www.appgamekit.com/documentation/home.html

I looked through that documentation and could not find that info. I only found basic sprite functionality under the "Guides" section under Sprites. Is there another section that has a better list of sprite functions?

Choose 'Commands' and then 'Sprites' (or whichever area of AppGameKit takes your fancy).

Wow, don't know how I missed that. That is exactly what I was looking for.