No, "speck" just means something very, very small. It often refers to a spot of dirt. "Speckled" is the word you are looking for.

肥肉 means fat or fatty meat, not speck. The best translation I can think of for speck would be 斑点 or 小粒 For example a speck of dust-一粒灰尘. A speck is something very small

肥肉 - speck

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