You can only use a tame once, highly recommend 5 Turtles all on passive. Do not be on tame when the noglin mounts because it can glitch and will not latch onto tames after the first one. Finally if the noglin does glitch and doesn't want to latch onto a tame you can knock it out to fix it.
I'm finding that on servers with higher Wild Dino levels, 5 Brontos are not enough for max efficiency. And since Noglins will eat 5 dinos before they lose efficiency, they are impossible to get max efficiency when taming them.