Would it be possible to make ground tiles removable?
Like for example in a swamp biome we could build log barriers on a tyle use a empty crock to get murky water which we could boil and get a few baskets of fertile soil from. After getting the water from the swamp tile it becomes a rough dirt patch or muddy patch that we could fill with grass seeds we harvest somehow from the green or yellow bioms to make savanna green land or we could use shovels to get the dirt out and make rock biome tiles.
I think it would be for the better if we couldnt change snow or dessert bioms due to the temperature changes but we could do things like using a buckect of water on the desert tyles then adding grass seeds or digging out the soil. With the snow we could burn a few logs on it to thaw it then use a bucket of water then seeds or dig.
And if thats all to complicated maybe we could do it Dont Starve style and make a pitchfork or something that allows us to roll up tyles to place somewhere else on rock biom tiles.