peewee vs runt of the litter

peewee

noun
  • A short or small person; a small object. 

  • A kind of small marble in children's games. 

  • A pewee. 

  • A magpie-lark or mudlark (Grallina cyanoleuca). 

  • A player in a sports league for very young children. 

runt of the litter

noun
  • the smallest and weakest person in a group, especially a group of siblings 

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