Suggestions Please

[Ninnynanny]

What is another name for a Crisp brittle biscuit, answer has 4 letters. Thank you.

[ubasses]

rusk?

[Sam1960]

rusk ?

[factor-fiction]

You may have more luck in Q&P as someone there may have done this quiz

[factor-fiction]

Forget that, I thought it might get overlooked in here. Rusk looks a good possibilty

[rockyracoon]

Snap?

[Old_Geezer]

Tack ?

[SeaJayPea]

Snap, surely.