I must be honost I havent played Shadowlands much and only went trough this zone for unlocking flying.

by default I only show name plates in combat so its weird this critter showed up full name plated and I could not find way to not let it show. Its the Hungry Gromit any other critter is just normal and has no nameplate visible.

screen shot of the bugger on right is a other critter does not show this.

I wish it does not have nameplat always shown.

I noticed the same thing. Suddenly critters showed up in the world with their name formatted the same way as quest NPCs.
The Hungry Gromit is in fact related to a quest https://www.wowhead.com/npc=179358/hungry-gromit#objective-of
So maybe they are treated differently than others? I'm just guessing here obviously.