bellyscraper vs putty knife

bellyscraper

noun
  • A piece of earthmoving equipment used to level land and build roads. A heavy equipment machinery with a blade on the bottom and a hopper on top, that can carry, scrape-up, and lay-down material. 

putty knife

noun
  • A similar tool with a wide, flat blade used by painters, plasterers, and carpenters to spread putty to fill holes and cracks. 

  • A hand tool with a flexible blade used by glaziers to apply putty to seal window panes to the frame and mullions. 

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