Trolls in Runescape are named after the first thing they try to eat. This is explained in the game by a troll named Dad IIRC. There’s also one named My Finger
This joke isn’t just a one off thing either, every troll has a name to go with it. You can even get a baby troll that you can feed most tradable items to to change its name to the item. A few people feed stuff like Christmas crackers to them to show off.