lastborn vs tadpole

lastborn

noun
  • The youngest child of a family. 

  • The youngest member of any company or organization. 

adj
  • Born last in a family; youngest in a the family. 

  • Younger than anyone else in a group. 

tadpole

noun
  • A small child. 

  • A child's basic drawing of a human being, having a detailed head but only sticks for the body and limbs. 

  • A type of cargo bike that has two wheels in front and one in back. 

  • The aquatic larva of any amphibian. 

  • A young toad or frog in its larval stage of development that lives in water, has a tail and no legs, and, like a fish, breathes through gills. 

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