Ride the captive crocolisk to Mistwhisper Refuge and then speak to Zepik for further instructions. If you lose Zepik's Hunting Horn, speak to Elder Harkek in Frenzyheart Hill.
Zepik is best hunter of the Frenzyheart. Zepik hunts big-tongues... ugly things near swamps that try to steal all stuff they can find.
Zepik going on long trek to break big-tongue shrine and try to scare them away. We no want big-tongues in this land anymore.
There a crocolisk chained on northeast side of hill, next to tree - go with Zepik and do what Zepik tell you.