Green’s Dictionary of Slang

grannam n.¹

corn.

c.1566		Harman Caveat for Common Cursetours in Viles & Furnivall (1907) 83: grannam, corne.
1592		Groundworke of Conny-catching n.p.: [as cit. c.1566].
1608		Dekker Lanthorne and Candle-Light Ch. 1: The Canters Dictionary Grannam, Corne.
1610		Rowlands Martin Mark-all 38: Granmer Corne.
1612		Dekker ‘The Canting Song’ O per se O O3: Redshanks then I could not lack / Ruff peck still hung at my back, / Grannam ever filled my sack.
1637		Dekker ‘Canting Song’ in Eng. Villainies (8th edn) O2: [as cit. 1612].
1648		Dekker ‘Canters Dict.’ in Eng. Villainies (9th edn).
1665		Head Eng. Rogue I 49: Grannam, Corn.
a.1674		‘A Wenches complaint for . . . her lusty Rogue’ Head Canting Academy (1674) 17: [as cit. 1612].
1688		R. Holme Academy of Armory Ch. iii item 68c: Canting Terms used by Beggars, Vagabonds, Cheaters, Cripples and Bedlams. [...] Grannam, Corn.
c.1698		B.E. Dict. Canting Crew n.p.: Grannam Corn.
1707		‘Rum-Mort’s Praise of Her Faithless Maunder’ in Farmer Musa Pedestris (1896) 36: [as cit. 1612].
1725		New Canting Dict. [as cit. c.1698].
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. 1725].
1754		Scoundrel’s Dict. 16: Corn – Grannam.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
[1887		Cornishman 6 Jan. 4/3: Specimens of mumpers' or tramps' talk [...] grannum, a barn].