Yes, it's spruik to rhyme with juke. I have had the entertaining discovery today that this is an Australian word of uncertain origin.
The Australian Macquarie Dictionary offers: /spruk/ (say sproohk) Colloquial --verb (i) 1. to harangue or address a meeting: to spruik the benefits of a unionised workforce. 2. to harangue prospective customers to entice them into a show, strip joint, shop, etc.: *In Chinatown they are now subtly spruiking for custom. --herald, 1990. --verb (t) 3. to promote; argue publicly for: to spruik the new legislation.origin uncertain --spruiker, noun
The New Shorter Oxford adds NZ to the mix, dates it as early 20th century, has no further clues about origins and says: "Esp. of a showman; hold forth, speak in public." With the spruiker, therefore, "a speaker employed to attract custom to a sideshow, a barker; a public speaker."
The spelling makes me wonder whether there's some Dutch or South African in there. Certainly there's a family resemblance to spreken, sprechen and that general family of words.