If it is an outdoors "grill", it is probably what Australians call a Barbeque. With increasing frequency, it is sometime known by its brand name as a Webber.
yes the usually eat them on the grill
You call people living in Australia, Australians.
Australians call them "lifts", but the word "elevators" is not unknown.
Watermelon, Australians just have an accent.
i presume you mean do Australians call us poms? if so yes
The grill master or head of the grill.
KIDS
it is a veranda
We call them thongs, and yes, many Australians wear them.
Australians commonly call chickens "chooks" (rhyming with looks).
Aussies or Australians.
csicskák vagytoook.