One of the weirdest name for a herb in Legion and for WoW probably. This herb with a name that is odd to pronounce can only be found in Stormheim and is more like the conventional herbs where nothing will spawn out of it while collecting. It seems like this herb spawns near the bottom of hills and mountains. Fjarnskaggl can be farmed pretty easily with the route shown in the map below.

Map of Where to farm Fjarnskaggl in Stormheim

Hope this helped with farming Fjarnskaggl in World of Warcraft.