What kind of tree do leprechauns supposedly live in?

They don't live in trees.

pumpkin tree's. they are very rare, and you can't see them in the regular world, but they are very common in the land of the platypusses. after all, they are a platypusses favorite food. the leprechauns live there because they are very good friends with the platypusses, and they can protect them from the honnaballoos. these like to eat the leprechauns.