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

Trophy Raptor Skull

NPC	Level	Zone	Chance
Devilsaur Elite	54 - 55	Un'Goro Crater	4.93%
Tyrant Devilsaur Elite	54 - 55	Un'Goro Crater	4.17%
Ironhide Devilsaur Elite	54 - 56	Un'Goro Crater	3.95%
Razzashi Raptor Elite	60	Zul'Gurub	3.41%
Lar'korwi	56		1.97%
King Mosh Rare Elite	60	Un'Goro Crater	1.52%