Hide the youngsters! Pad the water coolers! Get Derrek Lee into protecting custody! Heads up, people — Big Z is again on the town! Yep, former Cubs pitcher and one-time strolling volcano Carlos Zambrano — all 6-Four and 275 kilos (or so) of him — is suiting as much as play baseball as soon as once more in Chicago at age 37. But the large fellow’s not again with the Cubs, for whom he performed 11 of his 12 major-league seasons, from 2001 to 2011. No, he’s making a comeback as a reduction pitcher for the Chicago Dogs of the American Association of Independent Professional Baseball. Never heard of the Dogs? Well, they’re named after scorching