Yes. I was in a mixed Aus/US guild in WoW and we had many a spirited debate about proper cookies/biscuit terminology.
man but does it grind my gears to hear someone say "Anzac Cookie"
its a biscuit.
Nah, <spoiler=these are biscuits>http://www.eatfoo.com/files/images/20080315_-_buttermilk_biscuits/IMG_1805.jpg
Note that despite the similar appearance, American biscuits, which are basically a kind of fluffy, crumbly bread, are not the same thing as scones, which have a similar shape and texture, but are sweet and pastry-like.
OT: I can honestly say that I've never heard of Tim Tams, which is interesting, because they're made by Pepperidge Farms. The person who said it was an American company wasn't kidding.