Even the burliest tires can be punctured by the right thorn—cactus, goathead, tree. I recently punctured a double casing Maxxis Minion tire with a tree thorn. I’ve also punctured tires with Mr. Tuffy liners.
In general, Fat tires have fairly thin casings. Otherwise, they would be very heavy. So, Fat tires are easy to puncture. Fat tires are mostly intended for riding on snow.
The only way you are likely to solve this problem is to setup your bike tubeless. There are many videos on how to do this on Youtube but here are a some tips.
—Use tubeless ready tires. Many Fat tires are not tubeless ready.
—While single digit tire pressures are good for riding on snow, you need to increase your tire pressure to 13+ psi for Trail riding.
—Get a tire plugging system and know how to use it to fix flats that the sealant can’t. I like the Stans Darts. Carry a pump and a spare tube.