MacTurk, being summoned, came with steed afoam.1849, Charlotte Brontë, chapter 15, in Shirley, volume 2, Leipzig: Tauchnitz, page 305:
3 more examples
“Well, this old great-grandfather [whale], with the white head and hump, runs all afoam into the pod, and goes to snapping furiously at my fast-line.”1851 November 14, Herman Melville, “'”, in Moby-Dick; or, The Whale, 1st American edition, New York, N.Y.: Harper & Brothers; London: Richard Bentley, →OCLC, page 487:
Sunday beer / Afoam in silver rumkins1916, Aldous Huxley, “The Walk”, in Donald Watt, editor, The Collected Poetry of Aldous Huxley, New York: Harper & Row, published 1971, page 37:
a tugboat hauling barges, its bow afoam pushing its way through the ripples and waves1998, J. P. Donleavy, Wrong Information Is Being Given Out at Princeton,, London: Little, Brown, page 73:
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Covered or filled (with something foaming or resembling foam).
mighty horns of ale, and cups of gold afoam / With strong nut-coloured mead1896, John Todhunter, “The Fate of the Sons of Usna”, in Three Irish Bardic Tales,, London: J.M.Dent, page 112:
The garden was afoam with starry white cosmos backed by the stately phalanx of the Prince’s Feather.1933, Lucy Maud Montgomery, chapter 32, in Pat of Silver Bush, Toronto: McClelland and Stewart:
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1988, Charlotte MacLeod (as Alisa Craig), The Grub-and-Stakers Pinch a Poke, New York: Avon, Chapter 6, p. 48, […] Minerva […] arrived with a huge armload of costumes, followed by Zilla and a couple more, all afoam with petticoats.
2000, Jan Thornhill, “Extremes” in Drought & Other Stories, Dunvegan, ON: Cormorant Books, p. 126, Margot’s thick black hair afoam with Spic and Span, swooshing back and forth across a grimy kitchen floor