Goblin Raiders are raiders who are involved in Goblin raids, led by Hollowtoof. They drop items relevant to what they're raiding. When raiding they shout various phrases such as "Got one!" , "Hur hur hur!" and "I got a ..." They appear to be wielding the Raider axe.
These raiders will shout various phrases, and each time they shout this, one raided drop (logs for a wood-gathering goblin, seeds for a goblin on a farm) is added to that goblin. When it is killed, they drop all of it. For example when a goblin has said something three times, it will drop two logs and one oak logs.
They also appeared in RuneScape 2007 in Varrock at level 4. They shouted things like "Die human" and "take over Varrock!" and attacked the guards. They had the regular goblin drops.