true bug vs wog

true bug

noun
  • Any of various insects of the order Hemiptera and in particular of the suborder Heteroptera, that are wingless or have two pairs of wings, and have mouthparts adapted for piercing and sucking. 

wog

noun
  • A bug, an insect. 

  • A person of Southern European, Mediterranean, Middle Eastern, or Southeastern European ancestry. 

  • Any dark-skinned person: originally specifically an Indian, but later also anybody of North African, Mediterranean, or Middle Eastern ancestry. 

  • A pollywog, or sailor who has never crossed the Equator. 

  • A minor illness caused by bacteria, virus, intestinal parasite, etc. 

  • A person who is not a Scientologist. 

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