Yes, but you'll have to compensate for the fact that it's frozen - the outside will burn before the inside has a chance to cook, so you'll have to cook it at a lower temperature for a longer period of time.
Not the best way to cook meat. If it's a solid meat (not like hamburger) but chicken breasts, chops, etc you could run it under cold water.
ground meat is fine but dont cook a steak or chicken breast like that...it will way over cook the outside and leave the inside raw...
Yes, that's perfectly fine. But it'll take longer to cook. Try defrosting it in the microwave before you cook it.
You can but its easier to cook it and it will cook through better if you thaw it. It may taste odd
yes but for quick resuts do what Hales said .