Hi,
AFAIK a console application is visually pretty much a DOS app, ie. it doesn't use any of the Windows GDI, so no forms, graphics, etc.
You can change the font size in a DOS prompt in Windows (go to Properties, Font tab), so you can change this for the console app's PIF probably, but programmatically I don't know, I wouldn't think so.
Why would you want to anyway? It goes against what a console app is...