Yes, you absolutely can use those saplings to make a fence. Just set your saplings in the ground however far apart you want them, (I would do 15 inches) and then get all your weavers ready.
For the weaving part you could use Crepe Myrtle branches or Willow branches. You just weave it through over and under, over and under like a basket and before you know it you have a fence.
There are all kinds of videos online for how to make them. I have made them before and the Crepe Myrtle branches should be prolific this time of year around the neighborhoods. I hate it when people cut them, but you could recycle them.
Good luck with your fence. Wish I could see a picture of it when you are finished. Wish I could be there to help you make it.