forelimb vs outgrowth

forelimb

noun
  • The anterior limb (or equivalent appendage) of an animal 

outgrowth

noun
  • An appendage of an animal. 

  • A branch or offshoot of a plant. 

  • Excessive growth. 

  • A byproduct or consequence of an action or event. 

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