The Cleveland Browns have made a couple of practice squad related moves. First, they released RB Jamaine Cook, but almost immediately re-signed him to the practice squad when another team claimed one of their players. That team would be the New Orleans Saints -- they had to place S Kenny Vaccaro on injured reserve, and with their open roster spot, they claimed S Terrence Frederick from Cleveland's practice squad.
Originally a seventh-round draft choice by the Steelers in 2012, Frederick was waived before the start of the regular season and then ended up on the New York Giants practice squad. Frederick was in camp with the Giants this season. He was on Cleveland's practice squad all season up until this point, so he has to be happy to suddenly be joining a playoff contender.
Anyway, the loss of Frederick allowed the Browns to bring Cook back. The reason they originally released Cook was because they signed WR Conner Vernon (6-0, 192 lbs) to their practice squad. Vernon signed with the Raiders as an undrafted free agent out of Duke this past offseason. Vernon had a good camp with the Raiders, recording 4 catches for 42 yards in the preseason, but did not make their roster.