sled vs travois

sled

noun
  • A small, light vehicle with runners, used recreationally, mostly by children, for sliding down snow-covered hills. (A "sled" in this sense is not pulled by an animal as a "sleigh" is.) 

  • A vehicle on runners, used for conveying loads over the snow or ice. (contrast "sleigh", which is larger) 

  • A snowmobile. 

verb
  • To ride a sled. 

  • To convey on a sled. 

travois

noun
  • A historical frame structure that was used by indigenous peoples, notably the Plains Aboriginals of North America, to drag loads over land, pulled by person, dog, or horse. 

How often have the words sled and travois occurred in a corpus of books? (source: Google Ngram Viewer )