Do your fingers usually swell if you get frostbite?

Yes they can swell: And blister and can turn black. In all it is a thermal injury much like a burn with tissue destruction and hte deeper the extent of the frostbite, the deeper the injury ( much like a burn) the more destruction there is. Swelling and reddened skin is rather mild, followed by blistering, and then on to loss of circuation at deeper and deeper levels.If u have a mild case do not re-expose to cold soon.

Possible: With prolonged exposure to cold the circulation in the fingers decreases, and tissue may actually freeze if exposed long enough. Once you warm them up the circulation increases and the fingers can swell and even blister. Some swelling is usually not to bad, but if you get blisters, get seen for treatment.