checkerberry vs mountain cranberry

checkerberry

noun

  • The teaberry, Gaultheria procumbens. 

mountain cranberry

noun

  • The cowberry, Vaccinium vitis-idaea 

  • The mountain bearberry, Arctostaphylos alpina 

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