penny whistle vs tootle

penny whistle

noun

  • A tin whistle. 

tootle

noun

  • A soft toot sound. 

  • A trip or excursion. 

verb

  • To transport (someone somewhere). 

  • To make a soft toot sound. 

  • To go (somewhere); to amble aimlessly. 

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

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