Both players were signed after performances at the NFL Super Regional in Detroit last weekend.
Campbell, a 6-1, 245-pound fullback, attended West Virginia Wesleyan and was somewhat of an option in the receiving game. He finished his career with 625 yards and eight touchdowns. He attended the New York/New Jersey NFL Regional Combine.
White, a 6-2, 251-pound fullback, went to college at Hillsdale, and caught 94 passes for 1,145 yards and 12 touchdowns during his four-year career. He had 443 yards and five touchdowns during his senior season.
Neither were on NFL rosters a year ago.
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