i was doing the quest for these in the blasted lands, and after killing about 10 and not getting a single one i decided to check the drop rate on wowhead which is pretty high. i then scroll down to the comments and see a number of people saying they go through phases of getting none at all for 20+ kills, then multiple in a row on boars of the exact same name.
Sure enough the same thing happened to me, and randomly once i got my first one i get 3 more back to back.
This seems very strange to me, and i think it would be nice if a developer could have a look into it. If it had just happened to me i’d put it down to some very unfortunate RNG, but given the fact it’s happened to a number of people i suspect some boars have a 0% drop rate, and others 100% or something similar. Even though all the boars have the same name.