Yes, anditoo, Tonga Toast is the banan stuffed french toast coated in cinnamon & sugar. Its a little greasy, but very good.
We have been to Kona with a party of 7 and we were seated around a round table. We have also been with a party of 8 when we were seated along a long bench for one side of the tables, then we had seats on the other side of the table. Does that makes sense? When we first got there they actually set up an extra seat at the head of the table so Id say 9 could fit together without a problem. However, like most WDW restaurants, they probably wont be able to guarantee you will be seated together when making the PS, but upon arrival they will do their best to accomodate you. Good luck!