It can be, when it is used idiomatically, e.g turned down cold, cold sober.
Otherwise it is an adjective and the adverb form is coldly.
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No, because it is not describing a verb, adjective, or adverb.
Chilly is an adjective that describes nouns, e.g. a chilly night.
No, it is not an adverb. Colder is the comparative form the adjective cold. The adverb form is "more coldly."
No, it is not an adverb. Coldest is the superlative form of the adjective cold (meaning most cold). The corresponding adverb form is "most coldly."