crackleberry vs whimberry

crackleberry

noun
  • The high-bush huckleberry, Gaylussacia baccata, native to eastern North America, or the fruit of this shrub 

  • An imaginary shrub, or the fruit of this shrub 

whimberry

noun
  • The bilberry or whortleberry (Vaccinium myrtillus). 

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