I've found 3 spawns for this mob so far, all relatively close to each other in or around "boar alley" :
1) 3714 , 3101 between two rocks just west of the spire near where "A Jacked Rabbit" spawns.
2) 3760 , 3022 in the valley just south of the spire near where "A Jacked Rabbit" spawns, and
3) 4010, 2940 between two rocks near the hill by the river near where "Zirus the Bonewalker" spawns.
Update to above post. I only had the minor glyphs which did not have enough cold protection. The Lessor Glyphs helped considerably. Did they add these recently as I had not noticed them available until after the Unity 6 patch.
Got one of these from smelting Glittering Slytheril, but it's not immediately apparent what it's for. It doesn't sell for that much to a vendor (like 1s 75c or something), so I'm hanging onto it indefinitely I guess, lol. My assumption is that it will ultimately be used in Jewelcraft once that comes back online.
I was looking all over, digging up wild herbs trying to find Silverleaf. Luckily a friend asked for blackberries to make either food or potions i can't remember, and found the silverleaf digging up blackberries! So if you need a sprig of silverleaf, go dig up blackberry bushes.