Hobgoblins are like goblins, but more friendly and helpful. They do enjoy pranks like tripping people.  Generally children and pets are blamed for their pranks. They prefer to be alone and a group of hobgoblins is rare. They steal children's teeth left under pillows and use for their own teeth. Don't trust hobgoblins. Their spit can give you the Sight for a little while.
* photo courtesy of Arthur Spiderwick's Field Guide