The Collaborative International Dictionary of English v.0.48:

Stumpy \Stump"y\, a.
   1. Full of stumps; hard; strong.
      [1913 Webster]

   2. Short and thick; stubby. [Colloq.] "A stumpy little man."
      --J. C. Harris.
      [1913 Webster]

WordNet (r) 3.0 (2006):

stumpy
    adj 1: short and thick; as e.g. having short legs and heavy
           musculature; "some people seem born to be square and
           chunky"; "a dumpy little dumpling of a woman";
           "dachshunds are long lowset dogs with drooping ears"; "a
           little church with a squat tower"; "a squatty red
           smokestack"; "a stumpy ungainly figure" [syn: chunky,
           dumpy, low-set, squat, squatty, stumpy]

Moby Thesaurus II by Grady Ward, 1.0:

86 Moby Thesaurus words for "stumpy":
   bandy, bandy-legged, blemished, bloated, blocky, bowlegged, cash,
   chubby, chunky, club-footed, couchant, crouched, debased, defaced,
   deformed, depressed, disfigured, dumpy, dwarfed, fat, flat,
   flatfooted, grotesque, ill-made, ill-proportioned, ill-shaped,
   knee-high, knock-kneed, knocked flat, laid low, low, low-built,
   low-hung, low-level, low-leveled, low-lying, low-set, low-statured,
   malformed, marred, misbegotten, misproportioned, misshapen,
   monstrous, mutilated, neap, out of shape, pigeon-toed, podgy,
   prone, pudgy, pug, pug-nosed, pugged, rachitic, recumbent,
   retrousse, rhino, rickety, rocks, runty, scratch, shekels, short,
   simous, smash, snub-nosed, squat, squattish, squatty, stocky,
   stooped, stubbed, stubby, stuff, sugar, supine, swaybacked,
   talipedic, thick-bodied, thickset, truncated, tubby, turned-up,
   unelevated, wampum