dough scraper vs putty knife

dough scraper

noun
  • A rubber or metal implement used to scrape food, such as dough, off a countertop, out of a bowl, etc. 

putty knife

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

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

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