Prong is a Dozeratops and one of Blayde's minions, the other being Horn, his twin.
Biology
Prong is a Dozeratops, with a few notable differences: 1: He has larger spikes over his frill, 2: He has a tan coloring, and 3: Needless to say, he destroys the homes of other Dozeratops. He has only been featured once, in "Blayde", so redirect from here to "Dozeratops" for the rest of his behavior.