I'd be surprised if you already knew this cold environment landform (including you upper sixth), pingos are found in periglacial conditions, meaning they are found around the edge of ice sheets. This means you can find pingos in located areas such as the largest, at 48m high, the Ibyuk pingo in Canada(above), but pingos are also recognisable on the surface of Mars, indicating periglacial conditions there. Clearly at this point we should discuss what a pingo is. A pingo in the simplest terms is a hill with a core of ice, it is formed when water often from lakes found above collects in a talik (basically a ball of underground water) and the freezes, as it freezes it expands pushing the ground above up into the characteristic dome shape. These domes can vary between 100m and 2km wide. They are commonly found in periglacial conditions in Siberia, Greenland, Alaska and Canada.
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