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The Snub Cube as well as MANY other polyhedra are available from the Mesh Extra Objects Addon (a default Blender Addon).
Install it from Edit / Preferences - Addons
Search for: Extra Objects
Pick: Add Mesh: Extra Objects (Click the Check Box to Enable it)
In Blender's View Screen, use Shift-A / Mesh and scroll down to "Math Function"
Open Math Function and click on "Regular Solid"
In the "Presets" drop down select "Snub Cube" then left or right from the options.