"Destroyers" I think you can answer that yourself.
They are "Peacekeeping" floaty things!
Although the terms destroyer, frigate, cruiser, corvette seem to be almost meaningless. The USN new Destroyer design looks to be 14,000 tons. The PLAN 055 are 13,000. The SK and Japanese are over 10,000 tons. Plus Japanese a few destroyers look surprising flat on top. The new Italian design DDX is going to be over 11,000 too. We are seeing OPV/ corvettes over 3000 tons. Frigates are going to 8,000 tons. It is all over the map. And then don't get me on LCS, its a "small" ship at over 3000 tons.
Italian DDX
View attachment 68160
USN DDG(X)
View attachment 68161
PLAN 055
View attachment 68162
So by the CSC is in the water I guess 8000 tons will be "frigate" size.