While most orcs have a modest grasp of technology and take advantage of developments in weapons and armour, savage orcs have a more primitive, neolithic type society, and shun these advances.
They originate in the The Southlands, where the constant heat and bright light has a deleterious effect on Orcish brains. Savage orcs use weapons made of stone or bone and do not wear armour, though their bodies are marked with ritual tattoos. As part of an Orc & Goblin army, Savage Orcs are berserker troops, who fight with little regard to their own personal safety.
They are also fanatical worshippers of Gork and Mork, in fact their entire language is based around various inflections of the word Waaagh!.