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Snowflake is a hidden gene, yes. Marzipan Stollen is Hom snowflake, The Accomplishments of Like-Minded People is Hom snowflake (one-time only RS though), and Ghost of Christmas Present or Future (can’t remember which) is Hom snowflake but missing a copy of Appaloosa. I’m not aware of any that are specifically het snowflake.

Ooo, thank you. I have a Marzipan Stollen mare!

Snowflake is a homozygous recessive gene, meaning a horse needs two copies. Looking at the parents of this foal, only the mother is homozygous snowflake so the foal would only be heterozygous (you cannot tell if the father is a carrier, since he could be heterozygous and Appaloosa and it won’t show).
As to why the foal is not Appaloosa, both parents are only heterozygous Appaloosa. That means each parent only has a 50% chance of passing down their copy of Appaloosa. You had a 25% chance of having a few spot Appaloosa (what a horse with two copies of Appaloosa is called because most times you won’t see many spots), a 50% chance of having a regular Appaloosa (one copy of Appaloosa), and a 25% chance of the foal not inheriting either colt of Appaloosa from the parent. Your foal just happened to hit the 25% chance of not inheriting either copy from either parent. The foal IS heterozygous snowflake, thanks to the mother. You can have a non Appaloosa that carries snowflake, either heterozygously or homozygously.