juvenilia

plural noun

works, especially writings, produced in one’s youth: His juvenilia were more successful than his mature writings.
literary or artistic productions suitable or designed for the young: publishers of juvenilia.

pl n

works of art, literature, or music produced in youth or adolescence, before the artist, author, or composer has formed a mature style

“works of a person’s youth,” 1620s, from Latin iuvenilia, neuter plural of iuvenilis (see juvenile).

Works produced in childhood or youth, particularly written or artistic works.