Dull vs Tonto

Dull

name
  • A village in Perth and Kinross council area, Scotland. 

  • A surname. of Scottish and German origin. 

Tonto

name
  • A member of the Tonto Apaches. 

  • The Native American sidekick of the Lone Ranger. 

noun
  • A Native American who accepts a subservient position to a white person. 

  • A sidekick. 

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