My 2.5 year old is fascinated by forward rolls and attempts to do them on the floor and on the bed. He is not afraid of hurting himself, he also dives head first into the bed and such. I worry about him injuring his neck, because he is fearless and strong, and because his head is still so large so he cannot tuck it in as much as i can.
However, i have not been able to find any reliable information online about toddlers and the risks of forward rolls.