Yes, there are quite a few. You can find them on various fanfiction websites. Some might combine the magic of Harry Potter with the sci - fi elements of Stargate and the Goa'uld. Just search on the big fanfic platforms and look for ones with high ratings and lots of reviews.
One popular trope is the 'fish out of water' situation. For instance, a Hogwarts student suddenly finding themselves in the middle of a Stargate base surrounded by Goa'uld threats. Another is the power exchange trope, like a Goa'uld getting access to magic and how that changes the power dynamics.
One possible plot could be that in Goa, there is a hidden magical community. The Uld (assuming it's some sort of magical entity or group) could be hosting an event. Harry Potter and his friends arrive there and discover a new kind of magic that is unique to this place. They might have to face challenges related to local magic traditions and make new allies among the Goa wizards.
In Goa'uld Harry Potter fanfiction, there could be a concept where the Goa'uld symbiotes possess magical creatures in the Harry Potter world. Imagine a Goa'uld in a hippogriff or a dragon. This would not only change the nature of those creatures but also create a whole new set of challenges for the characters in the story. The Goa'uld's hierarchical society might also clash with the relatively egalitarian society of the wizards, leading to all sorts of power struggles and political intrigue.
Obviously, Harry Potter himself could be a main character. He could be drawn to Goa Uld because of some mysterious happenings that seem to be related to Voldemort or some other dark force.
One idea could be a story where Goa Uld is a new magical creature discovered in the Forbidden Forest at Hogwarts. The main characters, like Harry, Hermione, and Ron, have to figure out how to deal with it. Maybe it has some unique powers that can either help or endanger the wizarding world.
There are some interesting fanfictions out there that combine Goa'uld Queen and Harry Potter elements. One can start by looking on major fanfiction platforms like FanFiction.net or Archive of Our Own. You might find stories where the Goa'uld Queen's power dynamics are introduced into the wizarding world of Harry Potter, creating unique plot twists and character interactions.
It would be a really strange and exciting mix. Harry could have the Goa'uld's ability to possess others on top of his magical powers. He might use this to his advantage in battles against Voldemort, for example, by possessing Death Eaters. It would also change his relationships with his friends as they might be a bit scared or in awe of this new power.
A fascinating concept could be the Goa'uld trying to infiltrate the wizarding world. They might be interested in the powerful magic there. The fanfiction could explore how the wizarding community, with their unique spells and potions, would deal with the Goa'uld's attempts at invasion. There could be epic battles between the Death Eaters and the Goa'uld, or perhaps alliances formed between the good wizards and some Goa'uld rebels. This would make for a very complex and engaging story.
In this type of fanfiction, the interaction could be based on mutual interests. Maybe some Goa'uld are interested in the Philosopher's Stone for its potential to grant immortality. So they might try to make deals with the wizards. However, the wizards would be very cautious as they know the Goa'uld's reputation for being manipulative. This would lead to a lot of tense negotiations and possible betrayals.