I remember there's a cave in the North of Skyrim on a small island if I am not mistaken and there are two frost atronachs that are not summoned by anyone and you must fight them. I think it's part of a quest. What's the name of the cave and how do you teleport to it through console command?
You are probably thinking of The Chill, an unmarked location in Winterhold:
It is a prison protected by Frost Atronachs: one is there when entered, and three more appear when leaving the cave.
Maybe you thought it was part of a quest because you committed a crime somewhere in Winterhold and had to fight your way out?
To get there using the console, type