fledgling vs youngin

fledgling

noun
  • An immature, naïve or inexperienced person. 

  • A young bird which has just developed its flight feathers (notably wings). 

  • An insect that has just fledged, i.e. undergone its final moult to become an adult or imago. 

adj
  • Emergent or rising. 

  • Untried or inexperienced. 

youngin

noun
  • A young one: a youth, a child, a kid, young person. 

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