What is a good source to read about thought experiments?

IDK but be careful, if a thought experiment explodes, it can blow your mind.

Have you taken a look at the plato.stanford.edu entry on such, specifically the bibliography?

https://plato.stanford.edu/entries/thought-experiment/#Bib

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The number of papers, anthologies, and monographs has been growing immensely since the beginning of the 1990s. It might be useful to highlight that in existing literature, Kühne (2006) remains the most substantial historical study on the philosophical exploration of thought experiments. And Sorensen (1992) remains the most comprehensive philosophical study of thought experiments. More than other monographs both of these studies well exceed the author’s own systematic contribution to what is widely considered the primary epistemological challenge presented by thought experiments. Also, this bibliography does not include the many (we count about eight) popular books on thought experiments (like Wittgenstein’s Beetle and Other Classical Thought Experiments by Martin Cohen); nor do we list fiction that is related to the subject (like The End of Mr. Y by Scarlett Thomas, or God’s Debris by Scott Adams). Further, for undergraduate teaching purposes one might want to consider Doing Philosophy: An Introduction Through Thought Experiments (edited by Theodore Schick, Jr. and Lewis Vaughn, fifth edition, 2012, Boston: McGraw Hill Higher Education), and chapter 5 of Timothy Williamson’s short introduction to philosophical method (Oxford University Press, 2020). Moreover, a number of philosophical journals have dedicated part or all of an issue to the topic of thought experiments, including the Croatian Journal of Philosophy (19/VII, 2007), Deutsche Zeitschrift für Philosophie (1/59, 2011), Informal Logic (3/17, 1995), Philosophica (1/72, 2003), Perspectives on Science (2/22, 2014), Berichte zur Wissenschaftsgeschichte (1/38, 2015)), as well as TOPOI (4/38, 2019), HOPOS (1/11, 2021), and Epistemologia (12/2022). Furthermore, a companion to thought experiments exists now: The Routledge Companion to Thought Experiments was published in 2017. Each includes substantial state of the art reports.

What's an applied thought experiment?

To frame thought experiments and their limitations, there’s a couple of recommendations.

A fundamental one is Dave Snowden’s Cynefin. It helps you match reality with how you’re thinking about reality. Cynefin helps to appropriately deal with thought experiments like the Raven’s Paradox. Similarly, there are other texts that help you critically frame thought experiments, such as texts on pragmatism, contextual functionalism, and relational frame theory. If I’m to recommend a single book, I’d recommend ACT in Context.

Now, as to thought experiments proper, there’s Daniel Dennet’s Intuition Pumps. That book holds plenty of thought experiments that I like.

I have another recommendation. It is a bit tangential, but maybe you’d be interested in George Lakoff’s framing. Lakoff would argue that frames are at least sometimes exactly the same thing as a thought experiment.