In all my years of repairing trolling motors, I have had one prop that I couldn't get off and had to cut off. I used a die grinder with a cutoff wheel to cut it off. Most will have a bent shear pin that is in-bedded in the prop material to hold it on. For this, if it's severe, the prop is no good any way so "if" you should break a blade while hitting it, it's no big deal. A ball peen hammer on the blades, close to the hub will get the prop off. I don't have a "prop puller" (never seen one). I do have several pullers, however, and to get them behind the prop hub would destroy the prop also.
John