noonflower vs pigface

noonflower

noun
  • Flowers of the family Aizoaceae, especially those of the genus Carpobrotus. 

  • Flowers of the genus Bauhinia. 

  • Tragopogon, a type of aster that closes at midday. 

pigface

noun
  • Any of various mesembryanthemums of the genus Carpobrotus, native to coastal areas of Australia, and producing edible fruits. 

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