seawolf vs wolffish

seawolf

noun
  • A strong-jawed North Atlantic fish of wolffish family Anarhichadidae, Anarhichas lupus. 

  • Any of various dangerous people and animals that attack at sea. 

wolffish

noun
  • Any fish of the family Anarhichadidae. 

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