Something marked with small dots or spots is speckled. During your walk in the woods, you might see a speckled fawn, a little speckled frog, or even a bunch of speckled eggs in a nest.
A shirt that's covered in tiny polka dots is speckled, and a street might be speckled with confetti after a parade. Animal coats with irregular flecks of color are often described as speckled, like the speckled coat of a brown and white horse. The origin of this adjective is uncertain, but experts guess that it's connected to the Old English specca, "small spot or speck."