We're now up to the fifth entry in this ongoing series of beloved Free RPG Day modules from Paizo, but the original still stands head and shoulders above the competition (which isn't hard, since they're goblins).
This is the famous free Pathfinder adventure that kicked off the craze of playing maniacal, homicidal, lyrical, pyromaniac goblins. Seven years later, fans of the system love the concept so much that goblin is now going to be a base racial option in the impending Pathfinder 2nd Edition.
Very much a tongue-in-cheek affair, We Be Goblins is a lot more fun if you play it for full silliness effect like a game of Paranoia, where a new goblin appears to replace an old one as soon as a player's character dies -- and they will die, a lot. Fireworks mishaps, stomping horses, angry tribal chiefs, wilderness dangers ... when you are three feet tall, carrying highly flammable material, and have a total lack of impulse control, then doom is always just around the corner.
There are pregenerated characters to use, but don't neglect having your players come up with their own goblin rhymes that use their character names! That should be the biggest part of character creation to really get your group into the murderous goblin nonsense.