Yes. Try to beat the normal Staff Ghost by at least 7 seconds because it will almost guarantee you to unlock a fast one. To tell if you unlocked a fast Staff Ghost, it will say something like, "A fast Staff Ghost has appeared!" at the bottom of the results screen after you beat the normal Staff Ghost. Fast Staff Ghosts are usually much harder than normal ones, but some of them are really easy, especially the one in N64 Sherbert Land.