calf vs tibia

calf

noun
  • The back of the leg below the knee. 

  • A chunk of ice broken from a larger glacier, ice shelf, or iceberg. 

  • A cabless railroad engine. 

  • A young cow or bull. 

  • Leather made of the skin of the calf; especially, a fine, light-coloured leather used in bookbinding. 

  • A young deer, elephant, seal, whale or giraffe (also used of some other animals). 

  • The muscle in the back of the leg below the knee. 

  • A small island, near a larger island. 

tibia

noun
  • The inner and usually the larger of the two bones of the leg or hind limb below the knee, the shinbone 

  • The third segment from the end of an arachnid's leg, between the patella and metatarsus. 

  • The second segment from the end of an insect's leg, between the femur and tarsus. 

  • A musical instrument of the flute kind, originally made of the leg bone of an animal. 

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