It all depends on the size and habitat the pikes are coming from. I think they all have pretty good sized teeth, but i don't think they have psuedocanines like the Parachromis species. Crenicichla sp.'jegui' has some nice chompers though...
My Xingu I group is the only group that I regularly let bite me (sort of a feeding ritual)...but it is through rubber gloves. I feel powerful bites, but the teeth don't tear the gloves.
Note: I DO NOT play those games with my larger fish (see the avatar)...the Xingu group ranges from 4" to 7" or 8".