"Speckled" has two syllables.
The word green has one syllable.
Yes, speckled can be an adjective--a speckled egg.
The antonym of "speckled" is "solid", "plain", or "unspotted", depending on context. These words suggest a surface without spots, dots, or markings.
Because many rocks does not look alike
There were five little speckled frogs sitting on a log. This is a delightful little song for many different children.
a speckled rock
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Speckled moray was created in 1932.
Speckled Bird was created in 1993.
Speckled Warbler was created in 1801.
Speckled Mousebird was created in 1789.
Speckled Tanager was created in 1850.