The Collaborative International Dictionary of English v.0.48:
Sheepback \Sheep"back`\, n. (Geol.) A rounded knoll of rock resembling the back of a sheep. -- produced by glacial action. Called also roche moutonn['e]e; -- usually in the plural. [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Roche moutonn'ee \Roche" mou`ton`n['e]e"\ [F., sheep-shaped rock.] (Geol.) See Sheepback. [1913 Webster]