Jim Carrey has a slight canadian twang (He´s canadian by birth)
Interesting that you use this phraseology. To my (American) mind, a "twang" involves a distinct drawl from the south or the west. I live very near the Canadian border (Detroit/Windsor), and am familiar with the Ontario accent...which we describe simply as an accent, not a "twang." (As you mentioned, Jim Carrey does have a discernable Ontarian accent. But keep in mind, different areas of Canada have different accents.)
Just my two cents, your mileage may vary, etc.
