So this suggestion isn't just about new trees that should be added, it also includes some revisions to ones that are already implemented and new items the trees can create.
First Tree: Sassafras
Sassafras is a smaller tree that should be added and should have a neat pattern for leaves, because Sassafras has 4 types of leaves! When chopped down the leaves only drop saplings, the planks should be a darker color. But the main importance on the sassafras is that, you can make root beer with it! To make root beer you would need 2 mugs 1 sassafras log, and 1 sugar to create 2 mugs of root beer! Root beer should provide a small speed bonus (maybe), and it should fill up as many food bars as hot chocolate. This tree should be in any temperate area, and should be uncommon in foothills, not found in mountain biomes, or cold biomes. These should not be party tree capable.
Second Tree: Hickory
Hickory trees are medium-large trees that drop hickory nuts. It has lighter planks and bark, similar to oak. Like the chestnut tree this tree should drop instead, hickory shells. These shells can be thrown like conkers but when they come in contact with an entity or block the shell break and hickory nuts appear. Hickory nuts will provide the same amount of hunger as roast chestnut. These trees should spawn in almost any temperate biome, also common in foothills, and very rarely found in mountains. They should be party tree capable.
Third Tree: Elm
Elm trees are medium-large trees that branch out at the top making them very wide. The planks will be dark red-orange, similar to cedar, and the bark should be close to what maple looks like in the game. These trees can spawn in any biome that isn't hilly, or mountainous, probably the most ideal biome for Elms would be Eriador/Gondor/Rohan, and any other biomes that are relatively flat. They should be party tree capable.
Revisions
This section will be for any fixing of any trees already in the game.
Apple Tree- I feel like the apple tree should be rid of, and instead a Red-apple tree should be added and a Green-apple tree should be added.
I hope you enjoyed my suggestion, please comment if you see any grammatical errors or if you would like to give feedback