There are multiple sub-types of grenades, including:
Standard grenade. Creates a small explosion, damaging all mobs, but not blocks.
- Sticky Grenade
On contact with any entity, it begins to stick and then explodes.
- Hand Bomb
Like the grenade, except they damage blocks the same amount as creepers.
To craft the Grenade, you need paper, gunpownder, and string.To craft the Sticky Grenade, you need the regular Grenade, and a slimeball.
To craft the Hand Bomb, you need string, tnt, and paper.