That was my answer. "Winkle is a common name applied to numerous different species of small, round, usually edible, snails. These are often species of sea snails..." https://en.wikipedia.org/wiki/Winkle
Why isn't wildebeest spelled with a "beast" at the end? And why do I always think it is? I'm surprised no one has complained about that not being an accepted spelling.
Tried like 30 different ways of spelling wallaby... one l, double b, walla walle (wallu?) walli, wally, bee,be bi,by. Everything apparently but the right combo. Maybe some leniency on spelling?
And, gotta love wombats.