The 73-year-old, of Peaton, near Ludlow, thought it bore an uncanny resemblance to a duck and contacted the Shropshire Star to show off her unusual find.
Mrs Clinton's son, Alan, grows potatoes, runner beans, broad beans, peas, beetroot, leek and cabbage in their back garden.
But she said she had never seen anything quite like it before.
"I just pulled it out the ground and I thought 'Oooh, it's a duck'," she said.
"We normally eat everything we produce from the garden but I can't bring myself to eat this one, it's got a kind of strange sentimental value to me now.
"It's got pride of place in the shed, where it will stay until it rots away. It made me smile, so hopefully it will make others, too."
It is not the first funny-shaped potato in the county.
Last year teenager Henry Stanhope, 14, of Ryton, near Dorrington, was forced to do a double take after pulling up a potato that bore a striking resemblance to the bear in hit Hollywood blockbuster Ted.
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