Palsa

Palsas are low, often oval, frost heaves occurring in polar and subpolar climates, which contain permanently frozen ice lenses. Like pingos, palsas consist of an ice core with overlying soil, but they are generally smaller than pingos, often occur in groups and may develop from ground water without additional hydrostatic pressure. Palsas are chara...
Found on http://en.wikipedia.org/wiki/Palsa

palsa

(from the article `permafrost`) Near the southern border of permafrost occur palsas, low hills and knobs of perennially frozen peat about 1.5 to 6 metres high, evidently forming ...
Found on http://www.britannica.com/eb/a-z/p/10

Palsa

A mound of peat that develops as the result of the formation of a number ice lenses beneath the ground surface. Typical size is 1 to 7 meters high, 10 to 30 meters wide, and 15 to 150 meters long. Found in the high latitudes. Similar to a pingo.
Found on http://www.physicalgeography.net/physgeoglos/p.html
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