flatty vs jackfish

flatty

noun

  • A flathead (fish). 

  • A hot rod fitted with a flathead V8 engine. 

  • A flat tire/tyre. 

  • A flatfish. 

  • A flathead V8 engine. 

jackfish

noun

  • A jack (in any of the senses referring to types of fish). 

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