Yes, called reveg. Simply putting the clone under 18/6 or 24hr light will revert it back to veg. Doesn't always work and it does take a long time, picture the amount of stress it would take you to turn back into a prepubescent. Sent from my HaGGarD ass phone......fap
Nah it's called Monster Cropping, Check it out. I haven't tried it yet myself but I definitely plan on it.
I have heard that it is very hard to get a flowering plant to root. I tried it once on an auto flowering female and was successful.