Other forms: striplings
You can use the old-fashioned noun stripling to talk about a teenager, though few people these days will know what you're talking about.
Like many old words in English, the -ling in this one clues you up that it's a smaller version of the real thing. Exactly how the strip part applies is lost in the mists of time, but it may have to do with being thin as a strip from lacking the muscular development of full manhood: the word stripling is a somewhat poetic epithet for a youth.