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In a large bowl, add the butter, salt, and vanilla, Beat using an electric mixer until creamy. Add the sifted powdered sugar and 3 tablespoons milk. Beat until smooth, adding more milk as needed for spreading consistency.
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Take about 1/2 cup of the frosting and place it in a small bowl. Stir in green food coloring gel, a small amount at a time, until it has reached desired color. Add more milk if needed for piping consistency.
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Take about 1 1/2 cups of the frosting and place it in a small mixing bowl. Reserve and set aside.
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Stir in orange food coloring gel, a small amount at a time, to the remaining frosting in the large bowl until it has reached desired color. Spread frosting over cookies. Mix more orange frosting from the reserved bowl as needed.
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Pipe the green frosting on the top of the cookie (stem) using a leaf tip.
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Add some sifted cocoa to the remaining reserved frosting and beat until combined. The amount depends on how much frosting. About 1 teaspoon per cup. Stir in black food coloring. Note that the frosting in the bowl will look more dark grey than black. It takes a good bit of black coloring to get it to the right color and it helps starting out with a chocolate frosting base. Pipe the black frosting on to the cookies using a #3 round tip to make the "faces".
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Store cookies on a platter in the refrigerator. If you need to stack them in a container to store, place parchment between layers.