What is the name of the giant snow monster created by Elsa?

The giant snow monster created by Elsa is named Marshmallow.

Elsa creates Marshmallow after Anna, Kristoff, and Olaf arrive at her ice palace on the North Mountain. Worried that they may endanger themselves, Elsa uses her magic to produce the enormous icy guardian and orders it to drive them away. Marshmallow serves as a powerful bodyguard rather than an ordinary yeti or naturally occurring creature.

The character is sometimes confused with Olaf, the friendly snowman Elsa and Anna created during childhood, or the Snowgies, the tiny snow creatures introduced in Frozen Fever. Marshmallow later confronts Hans and his soldiers, survives a fall, and returns to Elsa’s palace. A post-credits scene shows him wearing Elsa’s discarded crown, adding a comic moment to his otherwise intimidating role.