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The Giant Rat Ashes are one of the many Spirit Ashes and Tools found throughout Elden Ring.
The Giant Rat Ashes will summon spirits that are agile and can attack quickly. They have low HP, so they'll be taken out quite quickly, but they're ideal to use as a distraction and to deliver some quick attacks.
You can find the Giant Rat Ashes in West Windmill Pasture, in the northwest of Altus Plateau. When you reach West Windmill Pasture, you'll see stables near the windmill. Inside are a number of rats, and the Giant Rat Ashes on a corpse.