Nobody will advertise it as such, but ecotourism in Turkmenistan is definitely possible. You can stay at a homestay in Nokhur and hike in the mountains beyond. You can stay with nomadic shepherds, deep in the Karakum desert. You can camp in national parks, go look for dinosaur footprints and get invited for tea in rural villages.
Since Turkmenistan is such a locked-down destination, few of these experiences are talked about much, but that does not mean it does not exist or is impossible. Send us a message if you have such desires.