flea vs sand flea

flea

noun
  • A small, wingless, parasitic insect of the order Siphonaptera, renowned for its bloodsucking habits and jumping abilities. 

  • A thing of no significance. 

verb
  • To remove fleas from (an animal). 

sand flea

noun
  • Any of various small crustaceans of the family Talitridae (order Amphipoda), that are found on beaches and jump like a flea. 

  • A small tropical flea, Tunga penetrans; a chigoe (family: Tungidae, order: Siphonaptera). 

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