Mine have never changed.. however mine claim they can "mind trick" you into thinking they are human (as a means of camouflage).. but don't actually shapeshift.
Not sure if they are being honest about that.. sometimes mine love playing jokes as much as my leprechauns do..
Some people are like slinkies. They serve no useful purpose what so ever; but they still bring a smile to your face when you push them down a flight of stairs
I do not feed Trolls. I never seem to have a spare goat on hand when I cross a bridge; and I never like to waste a good goat on an annoying Troll. Ignoring them is such a wonderful option.
We tend to take life and the Internet too seriously. Don't allow others to tear you down or ruin your day. You live for YOU... NOT for them.