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All answers having "Frosty" as clue:

3 Character Answers:

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ICY



4 Character Answers:

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COLD

ICED

RIMY



5 Character Answers:

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CRISP

GELID

NIPPY

RIMED

SLUSH

WHITE



6 Character Answers:

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POETIC



7 Character Answers:

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ICECOLD

SNOWMAN