skeleton vs skeletal frame

skeleton and skeletal frame both are nouns.

Word	Noun	Adjective	Verb	Adverb
skeleton	Yes	No	No	No
skeletal frame	Yes	No	No	No

As nouns, skeleton and skeletal frame are synonyms defined as:

skeleton and skeletal frame: the internal supporting structure that gives an artifact its shape

Other synonyms of skeleton include frame, underframe.

skeleton (noun)	skeletal frame (noun)
the internal supporting structure that gives an artifact its shape	the internal supporting structure that gives an artifact its shape
the hard structure (bones and cartilages) that provides a frame for the body of an animal
a scandal that is kept secret
something reduced to its minimal form