green bean vs kidney bean

green bean

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

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

kidney bean

noun
  • A variety of common bean, Phaseolus vulgaris, with a dark-red skin. 

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