Unfledged is a related term of embryonic.

In figuratively|lang=en terms the difference between unfledged and embryonic

is that unfledged is (figuratively) inexperienced, like a tyro or novice while embryonic is (figuratively) something, especially a project, that is very new and is still evolving; something that has yet to reach its full potential.

As adjectives the difference between unfledged and embryonic

is that unfledged is of a bird that has yet to develop its wings and feathers and become able to fly while embryonic is (embryology) of or relating to an embryo.