head of hair vs syrup of figs

head of hair

noun
  • All the hair that covers the scalp of a person (excludes the beard and moustache) 

syrup of figs

noun
  • A wig. 

  • A type of laxative made from figs. 

How often have the words head of hair and syrup of figs occurred in a corpus of books? (source: Google Ngram Viewer )