We went in September and yes, you can order a regular kids meal at 'Ohana. They won't give you a menu, and you may have to specifically ask, but the kid's meals are available. I can't remember all of the choices but I think they have all the kids items that Kona has.
My DD has had the Mac and Cheese, and the other children with us had a hamburger and french fries and chicken and french fries, so I think you can get just about anything.
FYI, they were offered without us even asking...and our kids were just fine with Ohana's "standard" food, so we didn't need the kids choices...so I'm relying on a relatively fuzzy memory on this.
they do have kids meals but my DS who was 7 at the time and my DD who was 1 both ate the food they served from the grill and loved it! It was my sons only request for this trip!