Gnoll Teeth Successor Quest?

[Extunarian]

Killing the Rabid Grizzly in Qeynos hills is a good one. Take the putrid bear pelt that it drops (no drop, but not lore) and give it to Priestess Caulriain the Qeynos Cleric Guild. The rabid grizzly is decent XP itself, and always wanders by the entrance to blackburrow, traveling north to south. You can kill the nearby gnolls for teeth between grizzlies

There aren't a lot of good turn-in quests for XP between 15 and 25, but once you get to 25 you can go to High Keep and kill goblins for left goblin ears, which yield a pretty good amount of XP and the NPC for the turn in is right next to the camp.