decapod vs inkfish

decapod

noun
  • Any of various animals having ten legs or similar appendages, especially mollusks such as squid and cuttlefish. 

  • A nickname for either the 0-10-0 or 2-10-0 train configurations. Sometimes capitalized. 

  • Any crustacean, of the order Decapoda, such as crabs or lobsters. 

adj
  • Having ten legs. 

inkfish

noun
  • An octopus or squid. 

  • A cuttlefish. 

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