1. I died a few hours back from the local boar and I wanted to know is there a way to remove it from my spawn point?You may be able to make a throwaway character and lure it away. You can start a new character at the same spawn point by saying your main character's hearth secret to the man in the NE corner of the character creation room when you make the new character.
edit: Oops never mind... just realized you wanted to remove the body not the boar
2. How can I plow on stomped to dirt land?Stomped dirt is not plowable.
3. How can I return stomped dirt to regular grass/plowable field(s)?[A]dventure -> La[n]dscaping -> Plant [G]rass
It consumes one seed. Vegetables don't work.
edit:
Dead body removalIf it's a skeleton, [A]dventure -> Destro[y] will work.
You can also "throw" a skeleton into the water by lifting it over your head, standing in shallow water, and relogging.
If it isn't a skeleton yet, it's indestructible and immobile for the time being.