sjambok vs truncheon

sjambok

verb
  • To whip with a sjambok; to horsewhip. 

noun
  • A stout whip, especially made of rhinoceros or hippopotamus hide. 

truncheon

verb
  • To strike with a truncheon. 

noun
  • A short staff, a club; a cudgel. 

  • A baton, or military staff of command, now especially the stick carried by a police officer. 

  • A penis. 

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