Translation:The young birds drink water.
So could you say "De jonge jongen?"
Yes you could :) There are some alternatives that could be used for that as well (and I think I would use them before using "jonge jongen"), like jongetje and jochie.
It is insane how similar Dutch is to German, at least in the rudiments. I almost made the mistake of typing the answer as "Die jungen Vögel trinken Wasser" xD