The Troth Bullhead IMO is one of the best sculpin imitations ever developed. Al Troth developed it for the monster browns found in certain areas of Montana's Big Hole, Beaverhead, Jefferson, and Upper Missouri rivers. It is Al's adaptation of Art Shenk's Sculpin (Art Shenk is one of the folks who fished with Marinaro and Charlie Fox in the spring creeks around Carlisle, PA) that has a tail, overbody of marabou in black, dark olive, or brown with the undertail of cream marabou, which was then twisted and wound forward to form the body. And of course, it had the spun deer hair head and collar of most sculpins. Shenk also ties the fly in all black, as does Troth.
Troth also developed a further variation of this fly that has a wool head, deer hair collar, marabou feather tip tail (natural grizzly, dyed brown grizzly, or olive grizzly, and a body of pearlescent braided mylar and an oval gold tinsel rib. Sometimes, Troth will add a palmered grizzly hackle to it and I've also seen him use plastic eyes on the sides of the wool head. I also never saw it smaller than a #4, and often saw it being used on #2/0 -#4/0 salmon irons.