Tight end Cody McCarty, cut by the Chargers on July 26, before training camp kicked into high gear, is back.
They also retained offensive tackle Ben Johnson who was signed to the practice squad on October 19 and remained there for the rest of the season.
Wide receiver Greg Camarillo, who spent the entire year on the practice squad, also returns with his future contract.
Running back Derek Farmer lasted a month in his first go with the Bolts but is back for another go.
Running back Larry Croom is perhaps the most experienced player on the list. He notched a start with Arizona in 2004 and gained 76 yards on 29 carries for the year before being released and picked up by Tennessee before being cut five days later. He was then signed by Detroit and lasted nearly two months on their practice squad before being released.
Free safety Mitch Meeuwsen was signed by the Dolphins as an undrafted free agent in 2005 but was released two weeks later after minicamp.