Kalian is plural "You" right? So is it not possible to emphasize the plural by saying [You guys have oranges]
Could it also be "You own oranges"?
Yes, I think so, it has the same meaning.
"to have" = "to own" = "to possess".
However, in English I think I wouldn't say that "I own oranges" or "I possess oranges".
I would say "I have oranges".
It means the same, and it sounds more natural.
(disclaimer : I'm not a native English speaker)