In that poem, as you point out in your own book, St. Nicholas is an elf.
Around that time, Leslie James Pickering was sent an announcement from elf taking credit for the sabotage.
The friends were even given military call names - elf, Bay and Airplane.
elf is pegged as a Christmas movie, but it hardly feels religious.
At this point, elf actions died down, and Pickering—along with McGowan, and several others—moved on to greener pastures.
He took the whistle from his neck and laid it in the elf's hand.
I can't remember about elf's christening feast; can you, Gilley?'
At this anxious request the elf started on a run, whooping and hallooing.
Blanche and elf were in the hall, looking rather excited and very shy.
The Imp likes cocoanut milk, but the elf hates it, and says it is just like medicine.
"one of a race of powerful supernatural beings in Germanic folklore," Old English elf (Mercian, Kentish), ælf (Northumbrian), ylfe (plural, West Saxon), from Proto-Germanic *albiz (cf. Old Saxon alf, Old Norse alfr, German alp "evil spirit, goblin, incubus"), origin unknown, possibly from PIE *albho- "white." Used figuratively for "mischievous person" from 1550s.
In addition to elf/ælf (masc.), Old English had parallel form *elfen (fem.), the plural of which was *elfenna, -elfen, from Proto-Germanic *albinjo-. Both words survived into Middle English and were active there, the former as elf (with the vowel of the plural), plural elves, the latter as elven, West Midlands dialect alven (plural elvene).
The Germanic elf originally was dwarfish and malicious (cf. Old English ælfadl "nightmare," ælfsogoða "hiccup," thought to be caused by elves); in the Middle Ages they were confused to some degree with faeries; the more noble version begins with Spenser. Nonetheless a popular component in Anglo-Saxon names, many of which survive as modern given names and surnames, cf. Ælfræd "Elf-counsel" (Alfred), Ælfwine "Elf-friend" (Alvin), Ælfric "Elf-ruler" (Eldridge), also women's names such as Ælfflæd "Elf-beauty." Elf Lock hair tangled, especially by Queen Mab, "which it was not fortunate to disentangle" [according to Robert Nares' glossary of Shakespeare] is from 1592.