Frozen chargrilled oysters

Are they just the shucked oyster on the shell frozen, where you can buy those at Wilson's Oysters in Houma I think for 144 pieces in a case, then load them? Or, they are loaded with cheese and garlic butter sauce then frozen?

How do they taste when frozen then chargrilled as opposed to shucking fresh oysters, then adding the garlic butter sauce, Romano and Pecorino cheese, and other fixings?

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They are already loaded and ready for the grill. Ive never tried them, but i might this weekend.

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I find oysters lose quality after frozen then thawed. I've frozen them in the past to use later for soups or in a seafood gumbo, but never to fry or eat raw.

With the sauce already on them and grilled, they may be good since that's a lot of outside influence in the taste and not just the plain raw oyster. It's worth a shot I guess.