cobblerfish vs sablefish

cobblerfish

noun
  • Any of various catfish. 

  • Trachinotus carolinus 

sablefish

noun
  • A dark-coloured marine fish, Anoplopoma fimbria, of North American Pacific waters. 

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