I was interested in this thread to. My boys are hungry often (go figure!), but the problem we were running into last year and I am going to guess it will happen again this year is that they started dropping weight and they don't need to do that. They were eating three balanced meals a day and a snack after school. Once summer hit I needed to up it to a light morning snack, afternoon snack and then something light before bed. They didn't always want something, but most often they did. They still lost weight over the summer, but it thankfully slowed down.
I found this recipe, I guess it's similar to the fritata but I thought perhaps it could be frozen after baking for individual portions.
and then some yummy sounding vegan recipes here for snacks
http://glutenfreegoddess.blogspot.co...veg-index.html
http://blogs.babble.com/family-kitch...ea/#more-32729