The word young as an adjective has no plural. Only nouns have plurals.
The word "young" to mean "young animals" is already a plural (collective) form.
That is the correct spelling of the plural noun "minxes" (catty young women).
"Soprano", plural "Sopranos", if you mean the highest singing voice of a woman or young boy.
The Latin for lion cub is catulus leonis, Plural catuli leaonis
The plural way to spell studio is studios.
The plural is hooves.
The plural is cherries.
The plural is cantaloupes.
The plural is resources.
The plural is roses.
The plural is "emeralds."
The plural is bridges.
Trout is plural