Zogres (also called Zombie ogre) are encountered during the Zogre Flesh Eaters quest and live south of Castle Wars. When burying their bones a Skogre may appear and attack. Their name is a portmanteau of 'zombie ogre'. They count as both zombies and ogres for slayer tasks.
Zogres are almost immune to normal weapons (you will hit just as often, but damage is reduced by 80%, Halberd of any kind recommended to strike from distance), but fire magic and brutal arrows are effective against them. Poison works full power, so poison potions might be good against them. Also, the damage done by your summoned familiars is not reduced.
They used to infect you with Disease, but this status effect was removed from the game with the introduction of the Evolution of Combat.
The Zogre playing the drums can be attacked, but only with Ranged or Magic. You will also need to telegrab their items, should you wish to pick them up.
The colour of the drums that the drumming Zogre plays is slightly lighter than that of the other drums.