Is there an offical plugin that will descreen halftone photos?

That seems a bit like spam. 

There is also a discussion on the topic of FFT: https://community.adobe.com/t5/photoshop-ecosystem-discussions/are-there-any-fft-fast-fourier-transform-plugins-for-photoshop-cc/td-p/8447690

Fast Fourier Transformation might also work out. (Edit: Not a default Adobe Filter, though.) 

FFT Wizard 2 - Simple and Effective Pattern Suppression FFT Plug In for Photoshop

One of the neural filters has a descreen option, I think in Photo Restoration from memory. That being said, I doubt that it's going to live up to your expectations.

Are the images color or monochrome? If they are mono, and you have clearly defined dots, you can do this:

Rotate the image so the dots are aligned vertical/horizontal., usually 45°. Use image size to scale the image up. You need the distance between dots to be an integral (non-fractional) number of pixels. Run Filter > Noise > Median, and use the arrow keys or scroll wheel to increases/decrease the value, until it matches the distance between dots. Look for the crosshatch effect to go away. The filter only works in whole pixels, which is why the size adjustment is needed. Rotate the image to return to the original orientation, and scale it back down to its original size.