As much noise as that's making, it's past swapping side to side.
If it was mine, I would invest in new units for both sides and prepare a front axle rebuild.
Adding grease may make it quieter, but it will not make the problem go away.
Sounds to me like the front axle needs to be checked in detail.
Possibilities in the order of least expensive to most.
Wheel bearings and spindles.
Basically, you need a front end rebuild. Start gathering parts or searching for a shop to do the work.