No, you can't send donkatsu medals from one ID to another.
Donkatsu Medals are very good currency in PUBG mobile KR Game. You can use donkatsu Medals to open crate and whenever you open crate in PUBG mobile kr you have very high chance that you get legendary items. You can earn 6-10 donkatsu Medals every week completing mission and daily login. And It's not transferable from one ID to another.