Moving SPNG was a bug that was fixed in TPT++. to make moving sponge again you'll either have to download an older version of TPT, or you can use PHOT or GRAV.
You can make sponge move in any direction with a bit of work, but you can only actually have it move either left or up once you save it. Which doesn't really matter since SPNG can't move anyway without the console.
I recommend you use PHOT if you want something like moving sponge. You just have to tell people to press '8', but you can have it move in any direction without any console commands.