The following drop 4 Green Charms:
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I would say an Ibis is the best way to level summoning in terms of Shards used and exp given.
Mithril dragons have a 50% green charm drop rate, dropping four charms each time, which is by far the best. All dragons in general have a fairly good green charm drop rate. The higher level the dragon is, the better change of getting charms. Level 96 cave bugs have an excellent drop rate...considering how weak they are. Cave bugs can be almost as good as mithril dragons, but cave bugs only drop one green charm each time as opposed to the mithril dragons four charm drop each time.
Never heard above green cowhide...
Currently, Baby Green Dragons do not exist in the game.
4*+ Elder quests. If I recall correctly, the Green Plesioth awarded Monster Bone+.