I camped these yesterday and they do spawn down below the maze, and are loot droppers (that non lore aug with corruption SV that Ice*crack* also drops) so I think they’re correctly flagged. Not sure if they are tied to above maze mini events, but I tried to keep those down each time they were up. Ice’s death seems to trigger Floe popping. At least, both times I killed Ice, Floe immediately popped. I’ve also had Floe pop on its own. And then if you aggro/dps Floe down slowly he’ll despawn and Icefloe pops in it’s place. Generally pretty lousy all the way around.