I took a better picture of his belly to show the speckling. @SlitherinSisters, I'll try to get a picture of his nose later--he has the same 'stache!
Thank you all for the informative replies! Almost looks like he tried to be a Spotnose, but didn't quite make the cut. Normals are neat with all their variation.
I may try breeding him a year or two down the road to see if that headstamp is hereditary, but for now I'll continue to enjoy him for what he is.Thanks again for the help!