All three of those spawn wild around the map, the map's author has a list of the dinos up, I think. Tek stryders I see around redwoods, I've seen Maewings in the sunflower planes, Shadowmanes down in the bottom of the main "Tek" cave, and Noglins outside it in the bog, among others. There's Dinopithecus and Sinamacrops from Lost Island too.