yea they do, read the orc codex. It talks about how there a half plant hybrid and they can regenerate, or recover for near any wound, talks about how the bodys must be burned after battles so none get up and start fighting again or something. i mean i dont think there like Trolls, but there very hard to kill, stabbing one dosent kill it persay. It aslo talks about how they multiply, there skin flakes off and when it lands in the proper condition, a cool dark place, an new orc grows like a root. An interesting part about there weapons, most of there weapons dont actually work in anyone but an orcs hand. The only reasion Orc weapons work is becouse orcs think they should work *shrugs* Orcs are so cool. The reasion there doc's can be so crude and the orcs still live is becouse of how durable the orc body is.
Now i dident mean in game play, i meant the Orc fluff says that