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You can grow a new tree from the suckers. If you dig around the base of the sucker, check to see if it has its own root system. If it does, you can simply dig it out and cut it away from the parent plant. Then place it in a pot and give it plenty of water until you see new growth. Then it can be planted out in the ground.

If you do not see that it has its own root system, scrape a little bark away from below the soil line on the sucker and then cover the wound back up with soil. Check back every month or so until you see roots develop and then follow the instructions above.

You can mound up the soil to the collar. They should be ok, as long as they are kept well watered.

It sounds like galls. Whether they are harmful or not depends on the tree. This article covers some of the more common ones:
http://www.ca.uky.edu/entomology/entfacts/ef403.asp

Cut the suckers and paint the fresh cuts with undiluted Round-up. This will get into the root system and kill the roots. It may take a month or so, but it will work. You can also try using a reciprocal saw to cut the roots out of the ground.

To correct the lean, tie a rope around the "tree" trunk and anchor it in the direction you wish the tree to go. Use a piece of garden hose over the rope where it touches the tree to protect the plant. Tighten the rope a little every few weeks to pull it back into the right angle. This will correct it without hurting the tree.

This artilce should help: https://www.gardeningknowhow.com/ornamental/trees/tgen/repairing-tree-bark-damage.htm