corp n [Scots, Ir, nEngl dial; back-formation from corpse, understood as pl (OED2 corpse n. 2.e 1488→)]

1798 in 1976 Heins Swan Albany 67 ceNY, The once Reverendet John Christopher Hardwig Lutheren Minister . . wished, and . . direcdet , that after his death his corp should be entered unter the pulpit in said Ebenezar church. 1870 Amer. Educ. Mth. 7.328 sePA (as of c1820), A dead body was vulgarly called a corp. 1911 DN 3.549 NE, New folk-etymological singulars are, in addition to the common Maltee, Chinee, . . etc., the more recent corp, and appendic, which are not infrequently heard. 1915 Kingsley Heart Philura 177 NEng, A body might’s well be a buried corp, an’ done with it, ef we didn’t open our mouths t’ say a word. 1917 DN 4.410 wNC, Corp. . . Corpse. [DN Ed:] Also S. Car. 1924 Shoemaker More Allegheny 93 PA, He’s a dead corp’ by now. 1998 DARE File—Internet cePA, [Language of the Hayna Valley], Corp House—A variant on Corpse House [=funeral parlor], as if there needed to be one.