Would this work?
Yep! Sounds natural
I don’t see how [name_m]Rocky[/name_m] is a nickname for [name_u]Roscoe[/name_u].
Definitely works. I love [name_u]Roscoe[/name_u]!
Yes absolutely.
Super cute, and yes it works!
It works. Not so much as a nickname as a pet name, perhaps.