The Collaborative International Dictionary of English v.0.48:

Nubbin \Nub"bin\, n.
   A small or imperfect ear of maize. [Colloq. U. S.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

nubbin
    n 1: a small nub (especially an undeveloped fruit or ear of
         corn)

Moby Thesaurus II by Grady Ward, 1.0:

91 Moby Thesaurus words for "nubbin":
   bantam, banty, bilge, blain, bleb, blister, blob, boss, bow,
   bubble, bulb, bulge, bulla, bump, bunch, burden, burl, button,
   cahot, chine, chit, clump, condyle, convex, core, crux, diminutive,
   dowel, ear, featherweight, fingerling, flange, flap, gall, gist,
   gnarl, handle, hill, hump, hunch, jog, joggle, kernel, knob, knot,
   knur, knurl, lightweight, lip, loop, lump, matter, meat, mini,
   minikin, minnow, minny, mole, mountain, mouse, nevus, nub, nubble,
   papilloma, peewee, peg, pony, rib, ridge, ring, runt, shoulder,
   shrimp, slip, small fry, snip, snippet, spine, stud, style, tab,
   tit, tubercle, tubercule, upshot, verruca, vesicle, wale, wart,
   welt, wisp