They’re called the “iPod Generation” — all those kids wired to earbuds and MP3 players this holiday season as they hunker down to endure long road trips or relatives that visit even longer. But they’re at risk of becoming the “Huh? What?” Generation. You’ve heard of BlackBerry Thumb? Now there’s iPod Ear. With the increasing popularity of MP3 players — and the loud, long listening habits of today’s youth — millions of children and teens are at a newfound risk of noise-induced hearing loss.