mantis vs walking stick

mantis

noun
  • Any of various large insects of the order Mantodea that catch insects or other small animals with their powerful forelegs. 

  • A green colour, like that of many mantises. 

walking stick

noun
  • A stick insect (order Phasmida). 

  • A tool, such as a cane, used to ease pressure on the legs, and to aid stability, when walking. 

  • A playing card with the rank of seven. 

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