The title comes from the file name, but Dan Froelich explained that the file names were in fact the proper full titles.
Jill of the Jungle: Jill Goes Underground (DOS)
In second game of the series Dungo is only played in "Montezuma's Castle" (levels 3, 4, 5, 6, 7 and 8).
The file in the game folder is named DUNGO.DDT.
Onesimus: A Quest for Freedom (DOS)
The file in the game folder is named SONG4.ARK