No monitor lizard is ever 'tame' or 'domesticated'. Some species tolerate humans better than others, some can be 'trained', and some are less likely to bite out of defense.......but they are never 'tame'.

If someone is interested in a 'first monitor', I would suggest getting some yellow ackies. They are small (avg. 18" TL) and the generally the 'friendliest' out of the yellow and red ackies.

Savs are not a bad choice for a first, but do require more space. And water monitors should only be kept by someone experienced with large lizards and adequate faculities to keep them.