Christmas berry vs goji

Christmas berry

noun
  • Synonym of toyon (“plant or its berry”) (Photinia arbutifolia, syn. Heteromeles arbutifolia) 

  • Synonym of spiceberry (“plant or its berry”) 

goji

noun
  • A fruit in the genus Lycium, especially in commercial products where it is promoted as a superfruit. 

How often have the words Christmas berry and goji occurred in a corpus of books? (source: Google Ngram Viewer )