fish slice vs putty knife

fish slice

noun
  • A kitchen utensil used to turn foodstuffs (commonly, burgers and omelettes) in a frying pan; a spatula. 

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 fish slice and putty knife occurred in a corpus of books? (source: Google Ngram Viewer )