April 14, The Barn at Gibbet Hill, Groton. If there were any doubts that veteran Boston Comedian Jimmy Tingle “still has his fastball”, they were dispelled tonight, as the celebrity auctioneer had the audience of bidders cracking up as he cajoled them to bid higher and higher for a great cause: the Acton Food Pantry. His appearance tonight was part of his Humor for Humanity program to fundraise for non-profits. For decades, Tingle has appeared on many late-night shows and comedy venues, and formerly offered his humorous commentary on the weekly news show, “60 Minutes”, with his trademark skewering of…