fledgling vs unfledged

fledgling is a noun but unfledged is not a noun.

Word	Noun	Adjective	Verb	Adverb
fledgling	Yes	Yes	No	No
unfledged	No	Yes	No	No

As adjectives, fledgling and unfledged are synonyms defined as:

Other synonyms of fledgling include callow.

fledgling (noun)	unfledged (noun)
young bird that has just fledged or become capable of flying
any new participant in some activity

fledgling (adjective)	unfledged (adjective)
(of a young bird) having acquired its flight feathers	(of birds) not yet having developed feathers
young and inexperienced	young and inexperienced
	(of an arrow) not equipped with feathers