Pidgin English vs pidgin English

Pidgin English

pidgin English

noun
  • Any very basic English; broken English. 

  • Any English-lexifier pidgin. 

  • The Chinese pidgin English spoken in Canton and Hong Kong, later spreading throughout the Chinese and Southeast Asian coastal region. 

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