You can get them from Mushmom and Mushmom's Grave.
At Ludi
pretty much anywere in maplestory near hennnesys..... many places
At Ludibrum
my bum :)
internet
In Sleepywood dungeon
You can't.
Henesys
you can find octopus by kerning city. they are in the construction site
Near perion
in the woods and the dark lair
MapleStory Anniversary, they are dropped by monsters.