TheWoWDBI often see a bunch of these guys lined up along a hill in the Winterdeep Mining Camp area. I assume it's some kind of bug.
EDIT - don't bother attacking them. They won't fight back but they don't award any XP.
Humanoid
Irontide Skyrider
Irontide Raiders
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Details
This roster comes from the current game client's data files, so it is not a complete list of every NPC in the game - older world NPCs that are no longer in the modern client are absent.
Community notes from Wowhead · 1 comment
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Level and Map Tracking
The game data tunes Irontide Skyrider for levels 10 to 60, Battle for Azeroth content.