Gimli Gloin's son
If I were a character in The Lord of the Rings, I would be Gimli, Dwarf, handy with an axe when orcs are about.
In the movie, I am played by John Rhys-Davies.
If I were a character in The Return of the King, I would be Treebeard, an Ent and one of the last of the shepherds of trees.
In the movie, I am played by Joyn Rhys-Davies.
The only things I can think of that these two have in common are:
1. They both have beards.
2. They're both ents, except for Gimli.
3. They're both played by John Rhys-Davies, the one cast member who has his political head on straight (at least out of the ones talking about politics).
I found one of these at Jollyblogger, and the other was listed at it.