Niño or chico.
Muchacho is a spanish word and means boy, a teenager or young man, In portuguese language it is spelled 'rapaz'.
Young/youths/young men
Niño is boy in Spanish.
It means "The Little Boy", or "The Young Boy" el = the chamaquito = little boy or young boy.
The word "pibe" in Argentinian Spanish translates to "kid" or "boy" in English. It's a colloquial term commonly used to refer to a young person, especially a teenager.
The word 'boy' is a noun, a word for a young male person.
'Shounen' means "young boy" in Japanese.
Young is joven.
'Shounen' means "young boy" in Japanese.
We also have this word directly from Latin "junior", in Spanish "júnior", pronounced ['ɟʝu.njoɾ], that refers to a father's unique boy child or having the father's name. 2. A rich young boy, the only in a family. Antonio júnior. Un júnior muy engreído --- A very conceited young rich boy.
Its joven
The correct word really depends on the context, but the Spanish word Joven means Young in most situations.