Yes, you can change both the font name and font size. Open the "terminal" application and enter the following line into the window:
open -a TextEdit .adom.data/.adom.cfg
Now scroll down to the bottom of the file and enter the following lines:
Font_Name = Courier New Bold
Font_Size = 20
Save the file ([SHIFT][S]) and restart ADOM. It now should use the selected font and font size. Make sure that you use a fixed size font (e.g. Courier, Courier New Bold, etc.) or the output may look garbled.
The files are stored in a hidden directory, but you can use Finder to access the files. Start Finder, press the [Shift][Command][G] key sequence and enter the following text:
where you replace <example> with your login name. Now press [Enter] and you're done.