The Snowgies are created as Elsa starts sneezing. The more Elsa sneezes, the more Snowgies appear. The Snowgies then scamper off to the castle courtyard, where they cause some mischief, most specifically targeting Anna's birthday cake. Luckily, Kristoff, Sven and Olaf manage to get them tamed by the time Anna and Elsa arrive and even have them perform a surprise for Anna. After a spectacular birthday party, the Snowgies get taken by Kristoff, Sven and Olaf to live in the ice palace with Marshmallow.
It also shows Olaf naming each one, such as; Sludge, Slush, Slide, Ansel, Flake, Fridge, Flurry, Powder, Crystal, Squalor, Pat, Sphere and William.
Like Olaf and Marshmallow, the Snowgies represent a certain element of Elsa's personality; in this case, her long dormant mischievousness and love for fun.
When the Snowgies are conjured, they appear in flashes of magic which take the shape of a snowflake.
Strangely, Olaf can be seen with his flurry throughout the short, while the Snowgies move throughout the courtyard and castle unharmed by the warm climate. It's unknown why the Snowgies do not melt, despite being in the hot weather of summer. This contradicts with the first movie, where, if not for his personal flurry created by Elsa, Olaf would have been melted after Elsa restores the summer.
One of the Snowgies has a face that looks like Baymax's face.