The Marsh Swamp

There could be a marsh with marsh trees (They have marsh logs and leaves) which you can make into marsh items. I also propose weapon trims and having the ability to put armor trims on your elytra. In the marsh swamp there could be a new type of frog (a blue one) that would produce aquamarine froglights. There could also be a friendly blue slime that you can tame with magma cream. This slime can grow to size 3 and at size 3 you can ride it. It would also deal damage to mobs (0 at size 1, 1 at size 2, and 2 at size 3). There could also be topaz found in the new marsh swamp. This topaz could be used in armor and weapon trims and can be fed to the blue slime for a chance for it to seek out the nearest iron. The iron veins would be small, however.