Other times, they are on mounts bolted to walls and platforms. You'll know one is nearby when you hear a pig snorting in the area. (This is a welcome change from the first Alice game when she would rather eat you.) Upon receiving the grinder, she'll inform you that she wishes to pepper pig snouts to add to her cooking.
You'll encounter your first when you run into the Duchess and receive the pepper grinder weapon. Peppered snouts reveal bountiful rewards and hidden secrets in Wonderland.