Generate a one-time pad from say a 256bit key?

Alice wants to give Bob her one time pad so they can use it for secure
communications, but as it's a large padfile she'd rather not give it to him
as it is. Can she give him a key of say 256 bits which Bob can then plug
into an algorithm such as a PRNG which uses the key as a seed to create the
pad?
Thanks


.

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