American Meteorological Society - Glossary of Meteorology

frost boil

  1. An accumulation of water and mud released from ground ice by spring thawing.
  2. A small mound of fresh soil material, formed by frost action.
    (Glossary of Permafrost and Related Ground-Ice Terms, National Research Council of Canada, NRCC 27952, Technical Memorandum No. 142, 1988.)