green bean vs haricot bean

green bean

noun
  • The immature pods of any kind of bean plant, eaten as a vegetable. 

  • The immature pods of numerous varieties of the common bean, Phaseolus vulgaris. 

haricot bean

noun
  • A herbaceous plant from the Americas, Phaseolus vulgaris, the bean of which is eaten as both a green bean and dried, when it is cooked slowly as Boston baked beans 

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