Mouth. Maw can be used for mouth when you want a less-than-flattering connotation: e.g., gaping maw. That may or may not be what is intended in the example. Judge for yourself.
Following is from an e-mail to Dana Milbank:
I enjoyed your phrase "grinning maw" and your connecting it to a barracuda.
I've used a snippet from "Smile, Though Your Head Is Aching" as an example at a site intended primarily for made-up words -- and for kids. You can find the result at maw.
If either you or The Washgton Post Company object, I will ask that the posting be removed.
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