We Finally Know Who Is Behind Each of the Clown Masks on American Horror Story: Cult

This green-haired psycho is the tallest clown in the group, which is why he fits the bill for Harrison (Billy Eichner is 6'3"). Also, in the grocery store, this clown appears to be having sex with another male clown over the watermelon display, which also fits Harrison, who is gay.

Finally, Toothy clown is the third clown who murders Serena. It fits that Harrison and Meadow are recruited together and help commit that crime with Kai. We find out for sure in episode five that Harrison is definitely the one under all those holes.