Are there problem sets for trace table problems? If not, what are some good topics to cover?
I'm not aware of such resources, and I expect that there wouldn't be. These are great problems, but you (hopefully) only need to do a few of them until the concepts click into place.
I didn't know these were called trace table problems, but I have often provided them to struggling students in three different contexts:

Absolute beginners, where it helps students understand the ideas of assignment and execution order
Strugglers, where it helps students understand whatever has them lost, and
Students working on very low-level problems, such as assembly, or on processor design.  Here it is more of a basic survival tool. There are few, if any, meaningful variable names, and working your way through the values is a straightforward way of figuring out what is going on.

And this gets me to why I don't think you'll find a specific resource for problems like these: in all three of these scenarios, the actual prompt is the specific code we're studying.  Tracing the values is just a tool to understand the code that is in front of you.  The value-add (and the overarching purpose) comes from that code, not from the trace table per se.