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What do you mean by frozen hub? I would agree, doesn’t seem like you have four bad props. Have you had the engine running on this boat before? If not, is it possible that the engine is mounted too high, or perhaps you have a short shaft engine on a long shaft boat? Any obstructions on the bottom of the boat, such as tranducers etc that might be messing up water flow to the engine?
I’m sure hoping you are incorrect about your hunch concerning the driveshaft splines. Unfortunately, your hunch is a good one. Pull the gearcase off and have a look at the driveshaft splines, you may or may not see evidence of bad crank splines. Do you have a spare driveshaft? If so, slip it up inside the crankshaft and try rotating it around. You have trouble if you can rotate the driveshaft inside the crank without moving the powerhead.
I wouldn’t just replace that powerhead until you have confirmed this is the issue. I would hate to see you replace that powerhead only to still have the issue.