lingonberry vs twinberry

lingonberry

noun
  • The berry of this shrub. 

  • A berry-bearing shrub, Vaccinium vitis-idaea, native to the cool temperate areas of the Northern Hemisphere. 

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 lingonberry and twinberry occurred in a corpus of books? (source: Google Ngram Viewer )