Whole books have been published on commonly believed fallacious (non-)knowledge…In the study of language, one case surpasses all others in its degree of ubiquity, and the present chapter is devoted to it: it is the notion that Eskimos have bucketloads of different words for snow.
-Geoffrey Pullum, The Great Eskimo Vocabulary Hoax
Or, if you’d rather have this belief debunked by T-Rex:
This trope has inspired numerous sarcastic comics, the term “snowclone” (“If Eskimos have N words for snow, X surely have Y words for Z”), and in turn a whole snowclone database, illustrated, of course by an army of cloned snowpeople.
(Note that “Eskimo” is considered offensive by Inuit people in Canada and Greenland, but is accepted as a general term for Inuit and Yupik people in Alaska and Siberia. More information.)