Technically, Herschel Walker was a rookie when he had almost 1600 yards from scrimmage. He was an awesome receiver as well as a devastating runner, difficult keep him off that list.
Bob Hayes needs to go higher in the ranks, quite possibly to #2 overall. He completely redefined the roll of a WR in one short season and almost single handedly ushered in the era of defensive zone coverage.
Dak is #1, hands down, the only one that would come closer is Everson Walls.
This is my revised list in reverse order starting with #1:
1 Dak Prescott
2 Everson Walls
3 Ezekiel Elliott
4 Bob Hayes
5 Zack Martin
6 Mel Renfro
7 Herschel Walker
8 Emmitt Smith
9 Tony Dorsett
10 Roy Williams
Some honorable mentions not on the original list:
Michael Downs - the other rookie DB in Wall's rookie season, he had 7 INT's
Leroy Jordan - As a right side linebacker, 3 INT's and a fumble recovery but during a time in which tackles were not recorded. He solidified the linebacker squad in 1963.
Harvey Banks Martin - If sacks were recorded at the time, he may have been the 2nd ranked of all time in the NFL. He was situational his rookie year, coming in on passing plays, he was a total disruptor. I can't tell you how many sacks he got his rookie year but I recall he was very very exciting to watch.