thousand-leaf vs yaffle

thousand-leaf

noun
  • Achillea millefolium or common yarrow, a flowering plant widespread in the temperate Northern Hemisphere, featuring finely divided leaves. 

yaffle

noun
  • The European green woodpecker, Picus viridis. 

verb
  • Of the green woodpecker: to make its distinctive cry. 

How often have the words thousand-leaf and yaffle occurred in a corpus of books? (source: Google Ngram Viewer )