Thanks guys for the replies! I think Mike got what I'm trying to say and I'll try to do what you wrote and hopefully with some positive results. Yeah, it looks very similar to a forward roll but actually it's quite very different!
Here, I try to demonstrate the difference between what you are talking about and a forward roll. Am I correct?
The reason I raise and tap my leg is to show which leg your weight should be on as you start the roll.