1) Autumn droppings 2) Burrow stash 3) Cache crop 4) Capped nuts 5) Card suit 6) Certain winter stash 7) Fall cache 8) Fall droppings 9) Fall from oak trees 10) Fall gatherings 11) Fall stash 12) Fruits of the oak 13) Furniture finials 14) Future oaks 15) Incipient forest 16) Nuts 17) Nuts for squirrels 
Acorns is British slang for the testicles.
This is one of four suits in the Württemberg pattern. It parallels Clubs in French-suited patterns like the American pattern.