I have a theory about this Mosa character, and it might as well be the "god of the forest"
1. Possible Connection to Old Norse Language:
"Mosa" resembles the Old Norse word "mósi", which can mean "mossy" or relate to nature and earth.
In Norse mythology, nature is deeply symbolic, with sacred trees like Yggdrasil representing life, fate, and the connection between realms.
2. Connection to Giants or Mythological Beings:
If Mosa is intended as a giant's name, it could align with Norse figures like Surtr (fire giant) or Ymir (primordial giant). I don't think this is the case.
Giants (Jötnar) were often associated with natural elements—earth, fire, water, and ice—so if Mosa has a meaning linked to moss, earth, or forests, it could signify a giant connected to nature, or Loki has the VOAT—giving him a connection to nature around him on a level we haven't seen before.
3. Hypothetical Role in Norse-Inspired Stories:
If Mosa is being introduced in an Elbaf-related One Piece storyline, it might be a name for a giant with ancient knowledge or ties to the Adam Tree.
Given the Elbaf arc’s focus on Norse mythology, Mosa could be a guardian figure, an elder, or even a being with connections to the past (Void Century).
I'm thinking that the Adam Tree houses the god of the forest.