So I ran past Hateno and scaled the mountain. Didn't get a quest but found theA guy in Hateno gives you a side quest about a spring the princess visited long ago. Don't remember exactly where he is in the village. Might be closer to the lab than the village.
dragon up there, and fixed it up. I will revisit the Necluda area later to see if Farosh appears. If this really was the trigger, I'm more than a little disappointed. It's unfair to the player to act as if an encounter with these things is immediately possible when it actually requires a trigger elsewhere on the map.