Chilly and Milly are Frosty and Crystal's twins who appear in Rudolph and Frosty's Christmas in July (though they are technically first seen in a fantasy sequence in Frosty's Winter Wonderland). Exactly how or when Frosty and Crystal gave birth to them is unexplained, though they were likely built out of snow just like their parents. They prove to be just as vulnerable to warm weather as their parents. They also love Rudolph very much, looking up to him as their adoptive uncle.
