Can I refreeze chocolate brownies?

I would not worry about them. They are full of sugar and very little protein to go off as pies might. I don't know if it might affect the texture ! In which case just pour custard over them and enjoy them that way.

Yes. They might dry out a bit, that's all

Freeze them in the original baking dish, placing a piece of plastic wrap directly on top of the brownies, another piece covering the whole dish, then cover the dish with aluminum foil. Use freezer tape to ensure the foil doesn't ride up. Thaw the brownies in their wrapping at room temperature.

Yes.

They contain a lot of sugar so I wouldn't worry about re-freezing them.

I still don't understand the question
It's like references to "left over wine" in recipes.
As Mañuel might say "Qué?"

Yes I would. You can refreeze chocolate brownies.

I believe it's safe to refreeze cakes and bread, can't see brownies being any different

Yea I would and have.