An amateur photographer who pretends to be a professional, derived from the amateur's penchant for simply "snapping" a camera's shutter release button.
Tyra, is the guy taking your picture a professional photographer? No, he's just a snapper.
Cindy, did your photo shoot turn out nice? No, it was awful. That guy was such a snapper.
Sadly, we have no good photos of our wedding because the guy we hired was just a snapper.