Using can bus as digital pins

hey,
just wondering if i can use the Can_n and Can_p as digital pins?

Thanks

No. They’re not connected to the nRF52 MCU, they’re connected to the MCP25625 CAN controller. It cannot use them as GPIO, and they’re also differential inputs - the values are compared to each other not to GND.

The best way to expand GPIO on the Tracker One M8 connector is a I2C GPIO expander. Application note AN013 shows how.