auto vs tro tro

auto

noun
  • An automobile. 

  • An autorickshaw. 

  • A setting for automatic operation. 

  • A car with an automatic gearbox / transmission. 

  • An automatic gearbox / transmission. 

tro tro

noun
  • A minibus operating as a share taxi in Ghana. 

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