It’s not a frown. It’s not quite a grimace. It’s not even really a sheepish wince. So what is this look that is captured in newspapers and Websites across the country today? The expression made the covers of both the Daily News and the Post into the dynamite keepsakes that they will inevitably become. We’re calling it “The Pucker.” Live it, learn it, love it. Or, you know, joke it, jeer it, judge it.