<Assuming you are unrooted>
Did you reboot your phone? Usually, an uninstall should have gotten rid of everything.
Also, from the app description at play store
HOW TO UNINSTALL FONTS?
- Go to 'Home > Setting > Application > Manage Application'
- Select font you want to uninstall
- Follow instructions
(Not sure what the last bit is - do you have individual fonts showing up in your app manager? If so, maybe you have to delete those one by one
Worst case scenario, you can perform a factory reset, and that should get you phone back to how it was when you got it (it will delete all your data, and all apps that you downloaded - basically back to how it was the day you got the phone)