I've been following Frogger modding for a long time, and the recent "Frogger Plus" mod gave me the drive to create my own custom level. The map was created via Blender and then imported into the Frogger modding tool "Froglord," where the rest of the work was done.
https://highwayfrogs.net/thread/34/froglord-ultimate-frogger-modding-tool
