tricycle vs tuk-tuk

tricycle

noun
  • An autorickshaw; A motorized cycle rickshaw 

  • A cycle with three wheels, powered by pedals and usually intended for young children. 

verb
  • To ride a tricycle. 

tuk-tuk

noun
  • A motorized rickshaw, especially Southeast Asia or India. 

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