You can convert Scratch projects in to applications here.
(SIMPLE WAY)
1. Your app's info must be open.
2. Draw it an icon and export/save it. Double-click it to open it.
4. Click and drag over the part that's going to be an icon. Press CMD C.
5. Go to that info window again, click the icon, and press CMD V.
6. AWESOME.
NOTE: The harder way is only usable for the full Scratch to change the actual Dock icon.

Offline
You're welcome!

Offline