The Froglok Warden in Upper Guk should use the Hide ability upon spawning. You shouldn't be able to pull him without see invis or proximity aggro.
http://eqbeastiary.allakhazam.com/se...97181917113595
I haven't actually camped him, but the 3 times I've ran through there and killed him he's always been visible. On Live, I would have to run in there and sit down at his spot to provoke him into coming out of hiding. Of course if you're low level, proximity aggro would bring him out also.