Pooh Shiesty swears he's innocent in his federal kidnapping and robbery case involving Gucci Mane ... and he said as much in court. The rapper was arraigned Friday in federal court in Dallas, Texas and pleaded not guilty to all the charges against him ... Pooh's lawyer, Kent Schaffer , tells TMZ. As we reported ... federal prosecutors filed robbery and kidnapping charges against Pooh, his father, and 7 other defendants, claiming they robbed and kidnapped Gucci and others back in January inside