No one know how to continue this quest. There are some theories with a plant called "Lady in the fog plant" and an NPC called A bearded Woman.
Btw i found this also in reddit "TibiaWiki spoiler tells us that in order to get Jerom's necklace we have to promise to bring a lady to the chief and we have to say a name of any female character on our server. The Troll Chief says the following: Character Name ?!? Sound good! Bring troll lady to Grarkharok!! Here, give troll lady! Take take! Bring lady to Grarkharok for make tribe!! Now GO!
To me the only logical next step would be to bring the character you have named to the Troll Chief (maybe with that character wearing Jerom's necklace on her neck)."
Hope it help :)