You asked:

are crackers a starch

No. A firecracker is not a starch.
firecracker
firecracker

firecracker (a small explosive device primarily designed to produce a large amount of noise, especially in the form of a loud bang)

starch
starch

starch (a complex carbohydrate found chiefly in seeds, fruits, tubers, roots and stem pith of plants, notably in corn, potatoes, wheat, and rice)

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