This effect uses the the Liquify Filter on Photoshop/Photopea

Thumbnail image gallery at bottom of page

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There two ways to do this.

You can use the Liquify Filter alone which would look like this:

If you go with this option, you must complete four edits.

See sample:

Mr. Lindroth’s Sample Slide Deck – Liquify Filter (no mask use)

Or

You can use the mask to stabilize part of the image and liquify the other parts which would look like this:

Mr. Lindroth’s Sample Slide Deck – Liquify Filter with Mask

You can do a combo of these two: two no mask liquify and one with mask

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Tutorials

Photoshop Video Tutorial for the Liquify Filter

Photoshop Video Tutorial for Liquifying the Background 

Photopea Video Tutorial Liquify Filter

Photopea Video Tutorial for Liquifying the Background