Is there and app for iphone 4s than I can put headfrom one photo to another body?

Is there and app for iphone 4s than I can put headfrom one photo to another body?

Yes, it's called Juxtaposer.

Yes it's called Face Mixer it's in the Itunes store and works great.

"Place your Face", "Place My Face", "Faces Wild", "Face Hole fun" and many more.

Search as "Face" in App Store you will find plenty of apps download as per your requirement and have fun.

Hope this solves your query.