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: In Shadowlands 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.