The Collaborative International Dictionary of English v.0.48:

Spraints \Spraints\ (spr[=a]nts), n. pl. [OF. espraintes,
   espreintes, F. ['e]preintes, from espreinte a desire to go to
   stool, from espreindre. See Sprain, v. t.]
   The dung of an otter.
   [1913 Webster]