From Nookipedia, the Animal Crossing wiki
Artwork of the snowpeople from New Leaf. From left to right: Snowtyke, Snowboy, Snowmam, Snowman

Snowfolks,[1] also known as Snowpeople or the Snowman Family, are characters in the Animal Crossing series who can be built by the player by rolling two snowballs together. A single snowperson, Snowboy (known as Snowman prior to New Leaf), appears in all games, and an additional three, Snowman, Snowmam, and Snowtyke, appear in Animal Crossing: New Leaf. Snowpeople typically reward the player with unique winter-themed items if built perfectly with correct size and proportions.