Definitions for "Periglacial"
Processes that are driven by the freezing and thawing of ice, which can be a strong enough force to crack rock and move large boulders.
Cold climates (with average annual temperatures of -15 to -1oC and seasonally snow-free ground), or surface features created under those climates.
Environments dominated by ground ice and freeze/thaw processes, as in the tundra.
'You may be looking for paraglacial, meaning unstable conditions related to local glaciation in the recent past.