He looks like either the poorly bred Silver Laced Wyandotte...but I am thinking possible Easter Egger (I can't tell if that is a rose or pea comb...or maybe inbetween???)...as you discovered you did not purchase an Ameraucana, since he does not fit SOP...meaning only those birds who fit the Ameraucana Breed Associations standard can be called, and most importantly sold, as an Ameraucana (which affects the value of the bird).
Often it is misinformed people who think Easter Egger and Ameraucana mean the same thing...which they don't...sometimes (even often) it is someone trying to cash in on the price of a rare breed.
Sorry he is a stinker...roosters can be that way...hopefully he'll settle down when his hormones do.
Lady of McCamley