As adjectives the difference between threefold and threepronged
is that threefold is three times as great while threepronged is having three prongs or similar parts.
As an adverb threefold
is by a factor of three.
threefold
English
Adjective
(-)
three times as great
triple
Adverb
(-)
by a factor of three
threepronged
English
Alternative forms
* three-pronged (much more common)
Adjective
(-)
(rare) Having three prongs or similar parts.