If you mean the food:
* Biscuit: A common alternative, especially in the UK.
* Cookie: A more general term for a sweet, baked treat.
* Breadstick: If you're thinking of a thin, crunchy cracker.
* Salty snack: A broader category for any savory snack.
* Crispbread: For a specific type of cracker made from whole grain flour.
If you mean the act of making a cracking sound:
* Snap
* Crack (this is a synonym, but it may be more descriptive depending on the context)
* Pop
* Click
* Bang (for a louder sound)
If you mean the derogatory term for a white person:
This word is offensive and should never be used. It's important to be mindful of the language we use and avoid perpetuating harmful stereotypes.
Please provide more context so I can give you the best possible alternative!