Horses that move at a trot (a pace between walking and running), or pig or sheep feet, especially when cooked as food.
From 'trot' (from Old French 'trot,' possibly from Frankish 'trottōn'), plus '-ers' to mean 'things that trot.' The food meaning comes from the literal feet of animals.
In old-timey cities, 'trotter' races were hugely popular where horses would compete at the trot specifically—it was an entire sport focused on that specific gait, and breeders developed special horse breeds just for trotting fast.
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