sheep (animal) / mutton (meat) / lemming, sheep (someone who follows a crowd and succumbs to groupthink) / mouton (coin) / dust bunny

(idiomatic) a black sheep

leapfrog

a traditional French dish composed of diced lamb ragout

lemming, sheep (one who follows a group without thinking for himself)

plural of haricot de mouton

(idiomatic) unicorn; black swan; flying pig (a kind of chimera that doesn't exist)

to count sheep (to attempt to go to sleep by doing something boring)

pastoral poetry

plural of roche moutonnée