Normally these 2 pins are used for external oscillator but the chip can be programmed to use internal clock instead for stand alone operation (not on Arduino board but custom PCB or breadboad). I looked at the pinouts and it's listed as PB6 and PB7 which means theoretically I can use that 2 pin via direct port manipulation as group port B. But there seems to be no way to control that 2 pins by itself like digitalWrite.
Is there a way to control pin 9 and 10 within IDE as individual pins?