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Although the exact phrase "potato head" hasn't been used, the resemblance of Sontarans to potatoes has been commented on & very similar phrases have been used. It was remarked on by Bea Nelson-Stanley in "Eye of the Gorgon" (Sarah Jane Adventures story), for example -- although there were no Sontarans present to hear what she said. Clyde Langer made the comparison in "The Last Sontaran" (Sarah Jane Adventures story) & did so directly to the Sontaran's face. The Eleventh Doctor also compared a Sontaran to a potato in "The Snowmen" but, as the Sontaran was Strax, that was much less risky.