Bishop was selected 192nd overall out of the University of California. A first-team All-Pac 10 selection in 2006, he became the first Cal player in 13 years to lead the conference in tackles.
Crosby, from Colorado, was chosen 193rd overall. A three-time All-Big 12 selection, he established a total of 31 game, season and career records at Colorado.
The Packers now have signed seven of there 11 draft selections. First-round pick Justin Harrell, second-round pick Brandon Jackson, third-round pick James Jones, and sixth round pick Korey Hall remain unsigned.