First off, Pronghorn Antelope only exist in North America.
I've never heard of a spike being called a prong spike or anything like that. Looks to be a plain old spike to me. The only spikes I call cowhorn are the ones with main beams that have rolled out and look just like a cow's horns. The rest are just spikes....big or small and I've seen some big ones. LOL! Congrats on the kill!:clap