Those seem like two separate processes which don’t need to be combined.
Look up ‘green hydrogen’ to find water being turned into hydrogen or amonia. Also new technology is enabling natural gas power plants to burn a % of hydrogen or amonia along with natural gas.
Desalination is its own thing and very power intensive.
To answer the question literally: yes!
And although it is inefficient and expensive, hydrogen is seen as a significant part of a low-carbon future world economy if we are to stop climate disaster. Countries with abundant sunshine or wind could export hydrogen (potentially).
For more detail, here are some links:
https://h2v.eu/hydrogen-valleys
https://chariotenergygroup.com/operations/green-hydrogen/
https://geo.om/
There are several large projects at various stages of financing for large scale green hydrogen production, some using desalination.
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