1.  sprog(n = noun.person) - a new military recruit;
is a kind of military recruit, recruit

2.  sprog(n = noun.person) - a child;
is a kind of child, fry, kid, minor, nestling, nipper, shaver, small fry, tiddler, tike, tyke, youngster

sprog, n. sl. a child; a baby.

Etymology:
orig. services' sl., = new recruit: perh. f. obs. sprag lively young man