Halloween is a foreign holiday, but it is also good to let your son know about it properly, so that he can increase his knowledge and know more. If you want to give your son a gift and let him have a good understanding of Halloween, you can give him an encyclopedia, such as 100,000 Whys. Children should be exposed to more books like this, which is also good for their growth. You can also give him candy and tell him about the tradition of trick-or-treating on Halloween Eve. This will not only make him like it, but also let him know the story of Halloween in a more vivid way, and he will be very interested. Halloween pumpkin masks and the like are also good choices. These things are very Westernized and are not often seen in the domestic toy market. This makes them more unique and my son will definitely like them. The above is my answer, I hope it helps you.