Now, look down the road a couple of centuries to a time when there is no permafrost in the area ...First you have to have permafrost.
There is no evidence of such on the coastal plain of the Carolinas.
Sure there is ~ the so-called "Carolina" bays occur from New Jersey to Georgia. That includes the portion of the coastal plain down the street from my home.
Nothing bug ice shaped rocks around here ~ gazillions of them too.