teaberry vs twinberry

teaberry

noun
  • A berry which is the fruit of a small shrub native to northeastern North America, Gaultheria procumbens (eastern teaberry, American wintergreen, boxberry, checkerberry). 

  • A pinkish-white edible berry which grows in the Falkland Islands, where the fruits are harvested annually by Islanders to make cakes, confectionary and pavlovas. On the South American mainland the leaves are brewed for tea (Myrteola nummularia). 

twinberry

noun
  • Its fruit, a bitter edible black berry containing several small seeds. 

  • A North American species of honeysuckle, Lonicera involucrata. 

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