Yes.
Exactly like
tr:nth-child in a css
Just use CSS in
conf/userstyle.css. If you don't want to apply the same styling to every table in your DokuWiki, use the
Wrap plugin on the tables you do want to uniquely style.
Example:-
cat conf/userstyle.css
tr:nth-child(odd) {
background: #ccc;
}
Which will only affect screen mode...