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The good news: PLA itself is non-toxic, and is often used in molded applications for food-safe tools.

Everything else is pretty much bad news. Your intuition is correct: The print resolution is going to give you lots of crevices for bacteria to hide in. All of the chemical smoothers are toxic.

You can use carefully applied heat to melt and seal the exterior. You can use abrasives to get a smooth finish. A cookie cutter or a measuring cup would be a reasonable use; I think a dumpling maker would be problematic from both a crevices perspective and from a mechanical stress perspective.