Amethyst Shale Worm

There are 3 tameable creatures with this look.

Amethyst Shale Worm
Exotic family: Beast Masters only - level 10+.Exotic Family
Can only be used by Beast Mastery hunters that have reached level 10.
Shale BeastsLevelLocation
Can Be Tamed
45Leyhollow, Azsuna
Can Be Tamed
45Tel'anor, Suramar
Found in a cave just north of Tel'anor. The entrance is just above in the "N" in Tel'anor on the zone map.
Can Be Tamed
Jagged Wastes, Deepholm
This gyreworm is available to Blacksmiths only. It spawns during the Blacksmithing quest An Ear to the Ground, which becomes available from your BfA Blacksmithing trainer when you reach a skill of 150 in Battle for Azeroth Blacksmithing. While the quest is in an open area, it appears to be phased so that only the quester can see the worms.
Level scaling: Most NPCs will scale with the Hunter's level, within the constraints of their level range. Hunters can tame regular NPCs up to 2 levels higher than them, but can only tame elite NPCs of the hunter's level or below.