I just did a test and the Font exists and can be used this is a GUI bug in the editor.
I created a custom block that made an execure block that inserts the code

lcd.font(lcd.FONT_DejaVu24)

and it runs just fine on my Core2 with latest firmware.
Im new to this system so I do not know where to report bugs and if this is actively developed.

In the online Beta version I can only set lcd.Font to default, no other choice.
This discussion is about saving memory but, the fonts are there, I can set them on the labels and they have 10 options.
Why are these options not the same fonts for lcd and for labels?
In blockly there seems to be no other way to dynamicly create text.