In Twenty-Six Nonsense Rhymes and Pictures, the entry for "D" says: The Dolomphious Duck who caught Spotted Frogs for her dinner with a Runcible Spoon. And it shows the only picture of this spoon.
And if you wish you can dine on mince and slices of quince which the owl and the Pussycat ate with a runcible spoon.
You will see that my spoon is indeed in the correct "duck" proportions. It is of course widely used in France to hunt frogs, and, I think, possibly also snails.