Neither was immediately signed to a contract.
Ford is a former track standout at Clemson.
Ford caught 13 passes for 99 yards and no touchdowns last season.
In four NFL seasons, Ford has 57 catches for 848 yards and three touchdowns.
Ford ran the 40-yard dash in 4.28 seconds at the NFL scouting combine in 2010.
Ohrnberger is a former New England Patriots fourth-round draft pick from Penn State.
He played in 13 games last season with one start for the Chargers.
Two seasons ago, he played in 13 games and started four for the Arizona Cardinals.
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Aaron Wilson covers the Ravens for The Baltimore Sun