little girl vs mollusc

little girl

noun
  • A weak-willed person. 

  • A female child, especially one younger than ten years of age. 

mollusc

noun
  • A weak-willed person. 

  • A soft-bodied invertebrate of the phylum Mollusca, typically with a hard shell of one or more pieces. 

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