I don’t have one now, but I’ve thought that a cleaver, with a mallet, would be very useful on some of the big hard squashes.
Yes, I will have to try it on a butternut squash- a task I never look forward to!
Best way to cook the winter squashes and pumpkins, to avoid the ER and bloody fingers on the kitchen floor: just put the whole squash into the 350 degree oven. At some point (depending on the size and hardness of your squash) take it out and you can easily cut it. Alternately just cook it whole and it will turn to nice mush all on its own.