cush-cush vs ñame

cush-cush

noun
  • Synonym of couche-couche 

  • A tropical American yam with small yellow-skinned edible tubers: Dioscorea trifida 

ñame

noun
  • Synonym of name (“yam”) 

How often have the words cush-cush and ñame occurred in a corpus of books? (source: Google Ngram Viewer )