Is it normal after MOHs surgery on the scalp for the covered wound to smell badly after two weeks and be red inside the wound?

I recommend that you follow-up with your Mohs surgeon as soon as possible. Foul-smelling discharge could indicate an infection, especially if you have any other symptoms (fever, swelling, redness, etc). If an infection is suspected, your doctor will perform a simple bacterial culture and possibly give you antibiotics.

My advice is to call your Mohs surgeon and see him/her so they can take a look. It really depends on what was done to stitch the area up or if it was left to heal on its own. Also sometimes patients get infections afterwards in about 1-5% of cases so again it is important to followup with your Mohs surgeon and give them the chance to evaluate the area. 

I would suggest you return to your surgeon for an evaluation asap. Because there is tissue there which is healing sometimes it can have a smell to it. But it's important to have the area checked and make certain there is no infection. "This
answer has been solicited without seeing this patient and cannot be
held as true medical advice, but only opinion. Seek in-person treatment
with a trained medical professional for appropriate care."