Items, NPCs, quests, objects and spells of patch 1.12.1, read live from the realm itself.

Groddoc Liver

NPC	Level	Zone	Chance
Groddoc Ape	42 - 43	Feralas	80.0%
Groddoc Thunderer	49 - 50	Feralas	80.0%
Groddoc Chestpounder	45 - 46		80.0%