The Collaborative International Dictionary of English v.0.48:

Topek \To"pek\, n. [Eskimo tupek.]
   An Eskimo house made of material other than snow, esp. one
   having walls of turf, driftwood, rock, or skin, and a roof of
   skins of the walrus or seal. In Alaska it is often partially
   underground and covered with timber and turf. Topeks are also
   used by Indians of the lower Yukon region.
   [Webster 1913 Suppl.]