Also found out why I couldn't get fonts to work in Godot - the fnt file keeps the word caligro when I save it with another name:
eg. font saved as "xevious_green":
info face=caligro...
should be:
info face=xevious_green-custom...
and
page id=0 file=caligro-page-0.png...
should be:
page id=0 file=xevious_green-0.png...