As others have asked what's the ship's endurance like and as an extension can the Merlin launch from a typical planet surface to orbit under it's own power?
Yes. While Snub craft won't have Quantum or Jump drives, they will be able to take off/land from planets on their own. And this would cover the Merlin, Archimedes, 85X, ARGO, and even the unnamed ship that comes with the Carrack.