Tonto vs yam yam

Tonto

noun

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

  • A sidekick. 

name

  • A member of the Tonto Apaches. 

  • The Native American sidekick of the Lone Ranger. 

yam yam

noun

  • A person who speaks the Black Country dialect. 

  • Heroin. 

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