Pippi Longstocking vs coppertop

Pippi Longstocking

noun
  • A person, especially a girl or woman, given to headstrong, wild behaviour, flights of fancy, or irrepressible optimism. 

  • A person, especially a girl or woman, with long or flamboyant red hair, especially in pigtails or parted down the middle, and prominent freckles. 

coppertop

noun
  • A person with ginger hair. 

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