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The most over the top way I can think of would be a foam molding material with wiring covered in monofilm but it's been ages since I've used monofilm and I forget exactly what surfaces it's appropriate for. Honestly I'd say just go for the tin foil idea, get a bunch to mould around your finger to make the basic shape and wrap with a skin of perhaps craft foil (thicker and shinier), twisting it towards the end and pulling it down in the hook. Cheapest, easiest, and quickest way I can think of making those and heck, it's halloween, you don't need to go nuts on details looking utterly perfect.
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