seedling vs tree fork

seedling

noun
  • a tree smaller than a sapling. 

  • one grown in a nursery for transplanting. 

  • A young plant grown from seed. 

tree fork

noun
  • A bifurcation in the trunk of a tree giving rise to two roughly equal diameter branches. 

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