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It was Vegapunk who created the fruit Momo ate. And this fruit actually resembles Kaidous fruit. (Caesar only created the SMILES)

Not sure about Big Mom. But there is a chance that the WG catched Kaidou once (most likely during Rox Era) and Made experiments on him. The greatest hints for this is actually that the Devil Fruit Vegapunk created (Momos fruit) seems to be a copy of Kaidous fruit.