There isn't a real boss like Zulrah, or the giant mole that you can kill over and over again for loot. Which is quite a shame, as trolls are one of the oldest monsters in Runescape and a troll boss would be a very cool idea with loads of interesting mechanics. There are however a lot of quests where you can encounter a troll that can be considered the troll boss.  * Arrg - This is the strong troll you will have to defeat at the end of the Quest Troll Romance. * Dad - Maybe the most famous troll in OSRS, you will have to fight him in Troll Stronghold Quest. * Ice Troll King - This is the troll that you need to defeat to complete the Fremennik Isles Quest.  * Kob - This is the strongest troll on this list, you will have to fight him during Monkey Madness II.  * Troll Generals - These are some pretty strong trolls that you will encounter on the top floor in the Troll Stronghold. Do not underestimate them. You can also kill Dad and Arrg in the Nightmare Zone once you have finished the Quests where you have to fight them. In the Nightmare Zone or the NMZ, there also is a hardcore option that makes them a whole lot stronger than their originals. That is the closest you will get to a troll boss in OSRS. Unfortunately, none of them drop anything useful.