Can I consume Hemp seeds as a dietary supplement while on Prozac (fluoxetine) 40mg daily? Hemp seeds seem to contain negligible amounts of tryptophan

No problem. Just about every protein food contains tryptophan, some more than others (such as dairy and turkey). There is absolutely no reason to avoid those foods while on Prozac (fluoxetine). There is a big difference between taking large amounts of Tryptophan as a supplement and having the amounts that occur in food. Hemp seeds is among the healthiest foods one can eat.