younker(n = noun.person) spring chicken, young person, youth - a young person (especially a young man or boy);
is a kind of juvenile, juvenile person
has particulars: blade, hobbledehoy, pup, puppy, pupil, school-age child, schoolchild, slip

   A young person; a stripling; a yonker. [1913 Webster]
"That same younker soon was overthrown." [1913 Webster]

younker, n. archaic = YOUNGSTER.

Etymology:
MDu. jonckher f. jonc YOUNG + here lord: cf. JUNKER

N  infant, babe, baby, babe in arms, nurseling, suckling, yearling, weanling, papoose, bambino, kid, vagitus, child, bairn, little one, brat, chit, pickaninny, urchin, bantling, bratling, elf, youth, boy, lad, stripling, youngster, youngun, younker, callant, whipster, whippersnapper, whiffet, schoolboy, hobbledehoy, hopeful, cadet, minor, master, scion, sap, seedling, tendril, olive branch, nestling, chicken, larva, chrysalis, tadpole, whelp, cub, pullet, fry, callow, codlin, codling, foetus, calf, colt, pup, foal, kitten, lamb, lambkin, aurelia, caterpillar, cocoon, nymph, nympha, orphan, pupa, staddle, girl, lass, lassie, wench, miss, damsel, demoiselle, maid, maiden, virgin, hoyden, infantine, infantile, puerile, boyish, girlish, childish, babyish, kittenish, baby, newborn, unfledged, new-fledged, callow, in the cradle, in swaddling clothes, in long clothes, in arms, in leading strings, at the breast, in one's teens.