gpioleds0 is. The built-in green LED (nanopi:green:pwr) and the blue LED (nanopi:blue:status). As described below, you can control the LED on/off by using the sysctl(8) command to change system-related variables.
For other GPIOs, you can use the gpioctl(8) command.
A C library is also available, which can be used with open and ioctl.
On NetBSD, the system hierarchy when using blinkt is as follows.