The first free agent signing of the season is in effect: the Tampa Bay Buccaneers have signed tight end Chase Coffman according to Howard Balzer of St. Louis' 101 ESPN. Chase Coffman was a star in college at Missouri, leading to his selection in the third round of the 2009 NFL draft by the Cincinnati Bengals. Coffman hasn't done anything in the NFL since then, however, and has a grand total of 3 receptions for 30 yards. Coffman was not on a roster last season.
Coffman is the son of Paul Coffman, three-time Pro Bowl tight end for the Green Bay Packers and Kansas City Chiefs. Chase Coffman may be best remembered from his appearance on the 2009 version of the TV show Hard Knocks, which chronicled that season's Cincinnati Bengals training camp. Interestingly Coffman is the third player I know of to have signed with the Bucs after appearing on 2009's Hard Knocks, as the Bucs have seen free agent Corey Lynch contribute for the past seasons, while fullback Chris Pressley was featured on the roster at times as well.
It's not clear what the terms of the contract are, but given Coffman's complete lack of production in the previous three years I would expect him to be little more than a camp body, likely signed to a reserve/future contract to keep him with the team throughout the offseason.