You should use load_form_disk after save_to_disk (it’s a serialized form for local disk - not optimized for online sharing but faster to reload locally):
from datasets import load_dataset, load_from_disk
raw_datasets = load_dataset("roneneldan/TinyStories")
raw_datasets.save_to_disk("Tiny_Stories")
raw_datasets = load_from_disk("Tiny_Stories")