Snow Sculptures

Snow sculptures (雪像) are sculptures formed from snow. A common type of snow sculpture is a snowman (雪だるま). Certain snow sculptures in the series have been given names and other attributes.

List of Snow Sculptures
These four snow sculptures received an entry in Vivre Card - One Piece Visual Dictionary.

Snowman-san
Snowman-san (雪だるさん) was a snowman created by Monkey D. Luffy aboard the Going Merry on the voyage to Whisky Peak. It had a body consisting of two spheres, sticks acting as its arms and a nose, a cape, and a barrel on its head. It was destroyed by Usopp in retaliation for Luffy ruining his snow sculpture. Its birthday was February 18.

Techniques

 * Yukidaru Punch (雪だるパンチ): A technique where Luffy hits one of the sticks acting as the snowman's arms, causing it to fly out and "punch" a target. It was first used to destroy the Snow Queen's head. It is known as Snowman Punch in the VIZ manga, but unnamed in the Funimation dub.

Snow Queen
The Snow Queen (スノウクイーン) was a snow sculpture of a woman created by Usopp at the same time Luffy created Snowman-san. The woman was depicted sitting on a chair, dressed in a knee-length robe, and bore resemblance to Kaya. The sculpture's head was destroyed by Snowman-san's "Yukidaru Punch". Its birthday was February 18.

Hyper Snowman-san
Hyper Snowman-san (ハイパー雪だるさん) was a much larger version of Snowman-san created by Luffy in the town of Bighorn on Drum Island. It was destroyed by Sanji who was angry that Luffy and Usopp were playing around at a critical time.

Shirora
Shirora (シロラー) was a snow monster created by Usopp. It resembled a dinosaur standing on two legs and was comparable in size to Luffy's Hyper Snowman-san. It was also destroyed by Sanji.

Trivia

 * An anime-original scene in Episode 96 calls back to these sculptures, with Luffy and Usopp building new "snowmen" out of rice (and being once again punished by Sanji).