That depends on where you found it. If you found it in an Oreo(r) cookie, then it was sugary, creamy filling, not Thermocol(r). See also: Weird Al Yankovic - "The White Stuff"http://www.youtube.com/watch?v=GvDgnsFrjSc
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Thermocol is a brand name for expanded polystyrene (Styrofoam, also a brand name). So. if it looks like Styrofoam or expanded polystyrene, then it could very likely be Thermocol.
You have single comment decimated my heat sink compound soliloquy :-PA
I had run across Thermocol in a few architect's specs over the years, so I was familiar with it.