Yes, this is one of the few “elf-” compounds attested in the OED. Why?
I’m giving him full credit for this one.
- 03.032 The master of the house was an elf-friend –
- 04.034 “Murderers and elf-friends!”
- 18.049 And I name you elf-friend
- 19.038 It is true that for ever after he remained an elf-friend,
“elf, n.1.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/60431. Accessed 13 September 2017.