bespeckle vs stipple

bespeckle

verb
  • To add speckles. 

stipple

verb
  • To use small dots to give the appearance of shading to. 

noun
  • The use of small dots that give the appearance of shading; the dots thus used. 

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