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All answers having "Frozen dessert" as clue:

3 Character Answers:

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ICE

INN



5 Character Answers:

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BOMBE

GLACE



6 Character Answers:

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FRAPPE

GELATO

MOUSSE

SORBET

SUNDAE

YOGURT



7 Character Answers:

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ICEMILK

PARFAIT

SHERBET



8 Character Answers:

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ICECREAM