mudbug vs yabby

mudbug

noun
  • A crayfish. 

yabby

noun
  • An Australian freshwater crayfish of the genus Cherax, especially Cherax destructor. 

  • A species of marine ghost shrimp, Trypaea australiensis, widely harvested by recreational anglers as bait. 

verb
  • To show disrespect by denouncing or insulting; to diss. 

  • To search, forage, or fish for yabbies. 

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