I dont understand what you are trying to say.

Freeze plugs have nothing to do with the block crack, necessarily.

They are not there to protect the block if you let the coolant freeze.
'Freeze plug' is a phrase that goes back a long time, and their purpose
is still misunderstood by some.

Those holes are in the block so that the casting sand cores can be
removed after the engine block is poured from molten metal.  The
core is washed out, and the holes are closed with 'Welch plugs',
aka freeze plugs.

If you count on them to save your block, you will end up walking.