Nose Guard. ( it's an American football position.) Then I would just rif on a nickname that fits the dog's personality. NG, Nosey,..
That dog looks like he just wants to rut under something. Or like Black Cloud just said, bust something !
I believe this dog to be a cross between pit and perhaps English Bulldog. If the ears had not been cropped he would look very bulldoggie. He's most likely just a Pussycat temperment despite his size...lol