codfish vs pollock

codfish

noun
  • A cod (the fish). 

  • The flesh of the cod as food. 

pollock

noun
  • Either of two lean, white marine food fishes, of the genus Pollachius, in the cod family. 

verb
  • To fish for pollock. 

  • To splatter, as with paint. 

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