Not out-of-box, but it should be possible based on Snowflake having a REST api. Using a Swagger based definition file to load in with the REST service type would expose those endpoints to K2 for use as  SmartObjects for consumption in Workflows, and SmartForms.

It’s a bit more technical, but a Custom Service Broker could also be written that provides the interface between K2 and Snowflake as SmartObjects, if needed.