creak vs vocal fry

creak

noun
  • The sound produced by anything that creaks; a creaking. 

verb
  • To make a prolonged sharp grating or squeaking sound, as by the friction of hard substances. 

  • To produce a creaking sound with. 

  • To suffer from strain or old age. 

vocal fry

noun
  • A low creaky vocal vibration caused by rapid vibration of the vocal chords. 

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