chirl vs tootle

chirl

verb
  • To emit a low sound; to warble. 

noun
  • A kind of musical warble. 

tootle

verb
  • To make a soft toot sound. 

  • To transport (someone somewhere). 

  • To go (somewhere); to amble aimlessly. 

  • To play (a musical instrument) making such a sound. 

noun
  • A soft toot sound. 

  • A trip or excursion. 

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