it was prolly pretty hard for naruto to use scrolls at that time. Now he could use them better, but a poison scroll is sorta useless.... why poison a dude when you can ghetto stomp the mother fucker with a massive frog and eighty of your clones?

Also, this is assuming it was a skill... it was prolly just a scroll that showed him how to make/detect poisons.... which he would need because he prolly didn't remember how.