In Headhunting, you hunt more Bloodscalp Trolls in northern Stranglethorn Vale, this time specifically their headhunters, and collect their [Shrunken Heads] to determine if Yenniku has been killed by them. This quest is in a long chain, all available in Grom'gol, the first being Hunt for Yenniku which can be obtained from Nimboya.
Nimboya can be found near the northern exit of Grom'gol, near a bubbling cauldron. Bloodscalp headhunters can be found in their main city in the north-eastern part of Stranglethorn Vale and along the northern coast.
Description
We must find if Yenniku is dead.
Slay the Bloodscalp Headhunters and take from them their Shrunken Heads. You must gather many, many heads, and I will inspect them to make sure Yenniku's head is not among them.
And if Yenniku was killed by the Bloodscalps, then may a 600-year curse fall on the spirit of their chief, Gan'zulah!
Go, <name>. You may find many Headhunters at the ruins of Zuuldaia and Zul'Kunda, along the coast to the north.