sand cookie

noun3

1. •
   (US) Name given to various types of shortbread.

   • Some of the wives poured and served up civilized cookies such as I haven’t had for months. ([Your] sand cookies are out of this world, therefore excluded.) — 1945
2. •
   (US) A mass of sand shaped to resemble a cookie by a child playing, similar to a mud pie.

   • A boy and a girl were playing in a large sandbox near my window. The little girl, who was singing, was very busy making sand cookies. — 1959
3. •
   (US) Any echinoderm of the order Clypeasteroida.