beshow vs coalfish

beshow

noun
  • A large food fish (Anoplopoma fimbria) of the north Pacific coast; the candlefish or sablefish. 

coalfish

noun
  • any of several blackish fish, especially Pollachius virens, a pollack, and Anoplopoma fimbria, sablefish. 

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