Brownie vs lassie

Brownie

noun

  • A junior Girl Scout. 

  • A junior Girl Guide. 

name

  • A nickname of the surname Brown. 

lassie

noun

  • A young girl, a lass, especially one seen as a sweetheart. 

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