I know that the Teleportation skill of Nature's Prophet isn't channeling spell, so it can't be interrupted.
But in this game between Alliance and Na'Vi, a neutral jungle creep interrupted this spell.
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You're correct that Teleportation isn't channeling. However, it is interruptible.
It has a custom 'cast point', which in this case is 3 seconds. Every spell has a cast point (sometimes it's 0), and if spells are interrupted or cancelled prior to the cast point, they don't go on cooldown. This is the same concept behind stop cancelling a spell that you decide you don't want to cast.
Indeed Teleportation is not a channeling however its cast point is very late. This means that there is a noticable period (with an animation) between the moment you start the spell and the moment where the spell is actually casted (when the mana is spent and when Nature's Prophet teleports). This animation can be manually canceled or interrupted by a disable. In this situation, you can see the Centaur use War Stomp which is an AOE stun thus canceling the spell.