In case folks need some pig sounds from other cultures:
Afrikaans: oink-oink
Albanian: hunk hunk
Catalan: onk-onk
Chinese (Mandarin): hu-lu hu-lu
Croatian: rok-rok
Danish: øf
Dutch: Varkens knorren.
English: oink oink
English (Old English): Swin grunað.
Esperanto: grunt
Estonian: rui rui
Finnish: röh röh
French: groin groin
German: Schweine grunzen.
Hungarian: röf-röf-röf
Japanese: buubuu
Korean: kkool-kkool
Norwegian: nøff-nøff
Polish: chrum chrum
Portuguese (Brazil): croinh croinh
Russian: khryu-khryu
Spanish (Spain): oink-oink
Swedish: nöff
Thai: ood ood (with high tone)
Ukrainian: hrju-hrju
Vietnamese: ut-it
Welsh: soch, soch
Source:
http://www.georgetown.edu/faculty/ballc/animals/pig.html