Gringoland vs Yankee land

Gringoland

name

  • A land of gringos; in particular, the United States of America. 

Yankee land

name

  • The United States. 

  • New England. 

  • The northern states region of the United States. 

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