Sherbet and Smarties exist in the US but we call them different things and have other things we call Sherbet and Smarties.

After googling it:

We do, we call them pixie sticks

Sherbet is like a different ice cream (icy fruit basically) to everyone else in the world

Like the other person said, in the states, sherbet is an ice cream that has juice in it. It's fruit flavored, but not as fruity, and more artificial tasting (imo at least) than sorbet. When they were eating sherbet in Bluey, I was confused why it looked powdery and in stick form. Googled and realized sherbet there is basically what a pixie stick is here.

Yes, sherbet is the same thing for us Poms.