Any new participant in some activity.

synonyms: entrant, fledgling, freshman, neophyte, newbie, newcomer, starter.

Dutch: beginneling, groentje, debutant, beginner, nieuweling, nieuwkomer
Polish: nowy

Young bird that has just fledged or become capable of flying.

synonym: fledgling.

Dutch: melkmuil, nieuweling
Polish: ptaszę

of a young bird Having acquired its flight feathers.

synonym: fledgling.