What is this item for ??

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which one?
a pineapple is legendary devil fruit
a barberry is a scroll to upgrade legendary df.

YEahhh, thanks, and how to use them and where?
i have tons of them and i dont know how to use it

in forge

synthesize fruit + two scrolls to upgrade it to +3 (works with df+2) - that's how scroll work.
to use df you need upgraded forge.
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2 - copper
3 - feather
4 - gauze
5 - stone
6 - fruit
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the best feather is Search Soul Feather
the best gauze is Dead Wood Gauze

ohhh thanks Demurechan, im so thankfully