Will galvanized pipes split or leak if frozen?
When water freezes it can split rocks. I've replaced burst Galvanized back in Wisconsin.
Before I address all your concerns let me explain how we winterize a house in freezing weather and you can make up your own mind.
I would recommend draining the water heater and blowing out the water lines, filling all the traps with motor oil or anti-freeze Drain thr toilet tank and pouring a gallonor so of anti-freeze into each toilet until it flushed away the water and retained the anti-freeze in the trap.
If this is not done then every fixture listed above is in danger of damage from freezing. Whoever owns the house should have winterized the house before it went on the market.
To add more problems you have copper pipes that's been vandalized.
My advice? Hire a sharp home inspector and check the place out before signing anything.
Good luck, tom