What are moth biscuits?

"Moth biscuits" is not a recognized food term. It's likely a misspelling or a play on words.

Perhaps you meant one of the following:

* "Mothballs": These are small, solid, aromatic balls used to repel moths and other insects. They are typically made of naphthalene or paradichlorobenzene, and should not be eaten.

* "Mother biscuits": This is a slang term for a specific type of biscuit, often referred to as a "mother's day biscuit" or "mother's biscuit." These are typically large, soft, and buttery biscuits.

If you can provide more context, I might be able to help you understand what you're looking for.