Does anyone know of any research in measuring metacognitive abilities (i.e. metacomprehension, metamemory, meta-emotions(?), etc) in people? In other words, I'm wondering if the same way we have IQ tests (which I know is a whole other topic of debate), if there would be a way to measure "meta-IQ"?
A good overview on the topic is Metacognition: A Literature Review (E. R. Lai), page 27 has a section assessing the measures of Metacognition.
Generally assessments focus on one specific area of Metacognition like Metamemory.
See also Development and Validation of an Objective Measure of Metacognition that assess four studies evaluating metacognitive abilities.
Searching around on Google Scholar finds a great deal of studies using and proposing various measures for Metacognition. There's certainly no "standard" like an IQ test, as Metacoginiton: A Literature Review notes, part of the challenge in studying and teaching Metacognitive abilities is due to the lack of focus on them in traditional school curriculum.