Wow, that's a let-down.
I don't have Fring installed at the moment, but I thought i remembered that in the Settings I was able to choose which camera to use even though my S7 only has a front (face) facing camera. But I might be wrong.
Unfortunately, with Angry Birds installed there's no room for almost any other apps... :-( Froyo is a must on this!
You can switch between main camera (back) and secondary camera (front) when you pressed the menu button while the built-in camera app or camcorder is running