I'm currently working on two connected continents for the world I'm building. They've created a convergent boundary where they meet, which has given rise to an east-west mountain range, in addition to a north-south range on the northern continent. There's also a deep bay or sea that will eventually close. The relevant section looks like this:
The problem is, the two continents have come together somewhere around my world's equator, and thus the fjords that formerly populated the northern continent in the northern polar region find themselves regularly enduring temperatures of 100 degrees Fahrenheit.
Actually, the above explanation - a continental merger - is not what I want. I'd rather have the two continents form together, where they are now, rather than have continental drift send one down from the north. This is because the east-west mountain range is inconvenient for the purposes of a story I've set in this world. However, I couldn't come up with a better explanation for equatorial fjords, although I did consider having a version of the Snowball Earth, which should cover the tropics.
Therefore, I turn to Worldbuilding Stack Exchange. Is it possible for fjords to form on the equator? If so, how?
It's worth noting, as I just found out, that Slartibartfast designed Africa with fjords for the Earth, Mark II, but he's not around for consultations.