Like others said, feed the snake in its enclosure. They aren't an aggressive species and cannot be trained to be aggressive by feeding them in their enclosure. If they seem "aggressive" when you open their enclosure you may not be feeding them enough. As for thawing f/t, put the rodent in hot water and keep checking on it. If it still feels a little hard/stiff it's not completely thawed. It can take a while sometimes, jut make sure the belly is soft and they are nice and warm.