tadpole vs tweenie

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. 

tweenie

noun
  • A child who is not quite old enough to be a teenager; a tweenager. 

  • A shot that is hit between the legs; a tweener. 

  • A 650-watt fresnel motion picture lighting instrument first manufactured by the Mole-Richardson Company. 

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