calf bone vs fibula

calf bone

noun
  • The smaller of the two bones in the lower leg, the fibula. 

fibula

noun
  • The smaller of the two bones in the lower leg. 

  • An ancient kind of brooch used to hold clothing together, similar in function to the modern safety pin. 

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