fledgling

Short definition from Wiktionary

Adjective

1. 1
   Untried or inexperienced.
2. 2
   Emergent or rising.

Noun

1. 1
   A young bird which has just developed its flight feathers (notably wings).
2. 2
   An insect that has just fledged, i.e. undergone its final moult to become an adult or imago.
3. 3
   An immature, naïve or inexperienced person.