It would be a waste of time listing all the monsters that drop guam, because in fact almost all monsters drop guam. But monsters like druids and slayer-monsters drop a bit more than others.
Well if you are referring to the Guam herb many npcs (non-playable characters) drop them throughout runescape.
You use a clean Guam herb on some swamp tar and there you go, you just made Guam tar.
Player made item. Use a clean Guam herb on a pestle and mortar, then use the crushed Guam on swamp tar to make Guam tar.
5,213,772.4 grimy Guam required, or 5,213,773 rounded, because we all know you can not have 40% of an herb =]
all monsters drop goodies except normal rats and spiders
In a recent update, Many monsters, such as guards, were updated to drop three grapes at a time.
Monsters drop them. As a general rule, higher level monsters drop better things.
to get items by drop you have to just battle monsters till you get the drop
Monsters in the god wars dungeon drop them. They're really hard to beat though.
When I trained range on fire giants i got like 100 blue charms or more their not likely to appear though that's just one of the monsters that drop them try going to a runescape help site and type in monsters that do drop blue charms.
hill giants and hobgoblins drop them sometimes
Toad Flax is a type of herb, found in RuneScape. To get herbs, you can buy them from other players, by trading in game or using the Grand Exchange. Another good way to get herbs is to kill certain monsters that drop them. Druids are perfect for this; they drop grimy herbs a lot.