You may be able to get chicken fingers but I doubt the pizza. We decided to change our reservation to lunch as my youngest will only eat the salad and fruit. We didn't want her to be hungry at the end of the night and want to eat junk, lol.
A few years back when we ate at one of the restaurants we asked if they had chicken tenders (which wasn't on the menu) and they were able to accommodate. (The original Skippers menu did not have chicken for kids)