beach flea vs sand flea

beach flea

noun
  • Any of various amphipod crustaceans of the family Talitridae, which live on sea beaches and jump like fleas. 

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 beach flea and sand flea occurred in a corpus of books? (source: Google Ngram Viewer )