Replace disc brake pads for Huffy mountain bike
Chances are the calipers are compatible with with something like BB3 pads. Problem is finding some will be more expensive than buying new calipers. You could look at pictures and 'take a punt' buying off the internet, or go to local bike shop that can match to your calipers with new pads - but that will cost at least twice as much.

I suggest spending a bit more and upgrading to a known brand of caliper, so when it comes time to replace pads you don't need to go though the exercise again.