The Collaborative International Dictionary of English v.0.48:

Noggin \Nog"gin\, n. [Ir. noigin, or Gael. noigean. Cf. 1st
   Nog.]
   1. A small mug or cup.
      [1913 Webster]

   2. A measure equivalent to a gill. Hence: a small quantity of
      a beverage. [Prov. Eng.]
      [1913 Webster]

   3. The head (of a person). [slang]

   Syn: noodle, noddle.
        [PJC]

WordNet (r) 3.0 (2006):

noggin
    n 1: informal terms for a human head [syn: attic, bean,
         bonce, noodle, noggin, dome]

Moby Thesaurus II by Grady Ward, 1.0:

22 Moby Thesaurus words for "noggin":
   bean, brain, brow, chump, conk, crown, dome, encephalon,
   gray matter, head, headpiece, noddle, noodle, organ of thought,
   pate, poll, ridge, sconce, seat of thought, sensation, sensorium,
   sensory