Would it also be okay to say the following?:
העוגות הן טעימות
It is fine but doesn't sound as good.
this is a mistake that has taken root. it's not fully wrong, but it is unnecessary duplication
It's not a mistake at all, that's proper hebrew grammar. It's just that israelis have terrible grammar.
Why not: The tasty cakes.
the tasty cakes means העוגות הטעימות (in these sentence it is already known that the cakes are tasty, while in the original sentence you claim that the cakes are tasty)
Haogot teimot ?
העוגה היא שקר
That tongue click in the beginning..