exotropia vs pickerel

exotropia

noun
  • A form of strabismus in which the eyes deviate outwards. 

pickerel

noun
  • Walleye, A species of gamefish, Sander vitreus, native to the Northern U.S. and Canada with pale, reflective eyes. 

  • A freshwater fish of the genus Esox. 

  • A wading bird, the dunlin. 

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