Do tamari pumpkin seeds contain soy, gluten, yeast, or whey?
Depends on how the tamari is made because tamari can have all these things in them unless otherwise stated.
Tamari sometimes contains wheat and always contains soy. Flavored seeds/nuts often use whey or other dairy products to make the flavor stick better and yeast could be used to heighten the glutamate level to make them taste more/better.
You can try making your own flavored nuts/seeds by buying raw nuts/seeds and roasting them (about 325 until they're crispy) after coating them with a little olive oil and whatever other flavorings you like (salt and pepper, vinegar, sesame oil and salt, etc).