An upstart or newcomer; nouveau riche; parvenu; an ambitious, brash or arrogant person who has yet to integrate with his or her new social group.
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.
Emergent or rising.
Untried or inexperienced.