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There are books which describe how each (known) fruit looks like and what power it has.
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Maybe the books were written by people who witnessed the transformations, which is why they knew what power each fruit held...at least until the next generation of DF. Perhaps it has to be a specific kind of fruit to transform and apple was fitting for the salamander fruit...but this is all speculation so all we can do is wait for Oda to provide some answers in a couple of weeks.