What is the name of the mod in Minecraft that makes trees grow faster when crouching?

I have a question about Minecraft. The question is already in the title, but I will mention it again here: What is the name of the mod where you can grow when you are under the trees?

With Skyblock you can

Sky Factory

I know what you mean.
Unfortunately I don't know a mod name. : /
The most fitting thing I found when googling was 'Growing trees Simulator' (is a mod).

NEN Modpack is true but there's in it. ^^

Thanks, but I would like to know the name of the mod and not the modpack