What is a “goblin-imp”?
Gollum used the One Ring to hunt and fish for food in and around his cave under the Misty Mountains and likely would have eaten Bilbo had he gotten the chance:
Only a few hours ago he had worn it, and caught a small goblin-imp. - The Hobbit
Watching the film version of Saruman create his orc army under Orthanc makes it appear goblins/orcs pop out of the ground as adults. I don't know if Tolkien came up with that idea, or if this is another case of movie magic created by Peter Jackson. What is a goblin-imp?