What do you call a reindeer with bad manners?

Deer-spectless

What do you call a Christmas tree that loves to solve mysteries?

A Spruce Lee investigator.

Why did the Christmas tree go to the barber?

It heard it was time to get a good trim and 'Deck the Halls!'

Why did the Christmas tree go to the therapist?

Because it was feeling a little root-less and wanted to branch out.