bokke vs sea raven

bokke

noun
  • Synonym of sea raven (“fish”) 

sea raven

noun
  • An American cottoid fish, Hemitripterus americanus, allied to the sculpins. 

  • Any fish in the family Hemitripteridae. 

  • The cormorant. 

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