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crumbly, crunchy, firm, fresh
Yes, "crisp" is a common noun. It refers to a type of food that is firm and crunchy, like a potato chip or an apple.
how do you make the withered celery stalk firm and crunchy in just short period of time
The word crunchy is an adjective. It is usually used to describe food that has a crunch.
The word "crispy" fits this description, as it implies a texture that is both firm and crunchy.