Yes, the sentence "Could you please stop mocking me?" is grammatically correct. It is a polite way to request someone to cease making fun of or imitating you.
It is Can you please stop
"Could you please stop sending me messages?"
"Could you please stop making cat noises?"
Could you please turn off the music?
"Will you please ask your children to stop bawling in my ear," is perfectly spelled correctly
Tell her to just forget about it and tell your friend to stop mocking her.
Could you please refrain from sending me multiple messages?
Could you please walk more quietly in the house?
Please come to a stop.
Yes. Example: Sir, would you please stop doing that.
I can give you several sentences.Mocking someone is not nice.He made me angry by mocking me in public.A mocking bird sang outside my window all night.
Yes in the end of Mocking Jay she does