Welcome to NGA,
@614gardengnome !
I agree with Sharon, I think they are some type of beetle larva (grub). (Maybe Japanese beetles?) And yes, I think you should get them out of the pots, since they are most likely feeding on your plant roots; probably by repotting the tomato plants, if possible. If repotting doesn't seem possible (because your plants might be quite large by now?) there may be something you could put into the soil but I don't know what that would be; if no one steps in with some better advice you could ask at a local garden center, or your county extension office.
