1) There is no thing as a "het snow". Snow is linebred and thus impossible to have a het.
2) the babies would be normal-ish looking (maybe a little lighter than normal because of the snow), and het for giant tremper.
3) again, a triple hom. isn't possible with these morphs. You can likely get a light looking giant tremper, and the get a "a" or "b" grade snow would likely take many generations of breeding. You might also NOT want to use a high-yellow or tangerine if you're trying to breed in some snow... the snow won't show as well as if you used a normal.
http://www.geneticswizard.com/
http://www.freewebs.com/stinauiuc/morphdescriptions.htm
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Brian Skibinski
Milwaukee Reptiles
Brian@MilwaukeeReptiles.com