andrewchris22 If you remember the name of the icon pack, you should be able to find it following the route Rob mentioned.
Eg, I installed Huawei health from Apkmirror, not the GPstore&it shows up when I scroll settings>Apps.
To help you identify the apk, open the Files folder, click on apps & select the heading that says"App install files (APK’s).
You should be able to uninstall it from there too.
But be careful!