I have a text label in my game like this
scoreLabel = [CCLabelBMFont labelWithString:@"0" fntFile:@"hooge2.fnt"];
scoreLabel.position = ccp( screenWidth * .9 , 20);
[self addChild:scoreLabel z:depthLevelScore ];
Can i change the size of this font with a code?
CCLabelBMFontis a Bitmap Font. That means the glyph size is hardcoded into the font itself. So if you want to change the size of the glyphs you need to edit your hooge2.fnt and reexport it.