For ease of reference, here are all the biscuit entries to date:

America

The Oreo

Belarus

Chocoline Cookies

The British Isles

The Prince of Biscuits
The Humble Digestive
The Rich Tea Biscuit
The Hobnob
The Chocolate Hobnob
English Jumbles
The Malted Milk
Dark Chocolate Gingers
Almond Thins
Iced Garden Biscuits
Jammie Dodgers
Gingerbread Stars
Lady Fingers 
Easter Biscuits
Shepherds’ Welsh Biscuits

Canada

The Maple Cream Cookie

Czech Republic

Linecké Cukroví
Czech Poppy Seed Biscuits

Denmark

Franska Vafflor

Finland

Doris Tryfelli 

France

Bredele
Navettes
Galettes Bretonnes
Macarons

Germany

Cookies of Joy

Holland

Stroopwafels

Italy

   Zuccherini al Caffe
   Grisbi Extreme Cookies
   Sicilian Mystery Biscuits
   Savoiardi Biscuits

Japan

Pocky Biscuits

Jewish

Hamantaschen

Latvia

Selga Biscuits
Latvian Beciņas

Miscellaneous

  The Dog Biscuit
  Lemon Moon Biscuits
  Florentines

Norway

   Ballerina Biscuits

Ukraine

Roshen Hazelnut Wafers