ketch vs pedalo

ketch

noun
  • A fore-and-aft rigged sailing vessel with two masts, main and mizzen, the mizzen being stepped forward of the rudder post. 

  • A hangman. 

verb
  • To hang. 

pedalo

noun
  • A small boat propelled by pedals that directly turn external paddles, used for recreation. 

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