App Help!! Cut Picture and place over another background?

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http://androidforums.com – Hello, first time poster so thanks in advance for any help! Im a Android convert from iPhone, been really pleased so far, there is just one thing I can't seem to do that my iPhone using friends can... They have an App called Photo Crop, which is able to cut the head off a picture and put said head onto another picture. (Layering?) Recent example... my friend has a picture of me, he cuts my head and then pastes it onto another picture of a man with massive 'moobs'. Hilarity ensues. I have searched for a similar app on Google Play but can't find one, anyone know of any? I have a ga (General)