Argonaut vs paper nautilus

Argonaut

name
  • One of the members of the Argo who sailed with Jason in search of the Golden Fleece. 

  • A team member for the Toronto Argonauts of the Canadian Football League. 

  • Any of several ships and submarines of the British and US navies. 

paper nautilus

noun
  • A pelagic octopus of genus Argonauta, found in warm seas, whose females produce a paper-thin egg case resembling a shell into which she deposits her eggs. 

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