black cod vs cobblerfish

black cod

noun
  • Synonym of sablefish (Anoplopoma fimbria); (the sablefish is not a species of codfish; but is referred to as cod informally) 

cobblerfish

noun
  • Any of various catfish. 

  • Trachinotus carolinus 

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