All lizards are cold-blooded, but some are just more cold-blooded than others.
Often referred to as the “Children of Borealis”, they are no relation to Queen Mab’s ally, the majestic Frost Dragon. Frost Lizards, probably through some fey magic, live a life quite the opposite of most reptiles; as it grows colder they become MORE active, and as the days lengthen and the sun begins to shine, they become quite lethargic. In fact, during the long Winters, when the blizzards settle upon the northern lands, they are so active, they often breed to plague proportions!