#android #androiddeskop is available by some vendors on some phones. This list is not authoratitve, but what I've found while rummaging around.

#DeX = Samsung's Desktop eXperience stuff and is confusingly sometimes used to generically describe Desktop Mode on any android phone. At the moment, I think that is wrong.

Deskop Mode seems to mostly about supporting entertainment such as video streaming and gaming.

Most references are just "Gee! Look! Desktop Mode!" and very few are just using it. But maybe that is just what happens when you run searches like I do.

#samsung - many DeX phones. Samsung is committed in this space

#motorola - "ReadyFor" phones including Edge 30 Pro

#LG - most of their recent phones, but is no longer making phones. V50 and V60, probably G7 and G8

#huawei - Honor phones

#xiomi - Mi and Redmi

#oneplus - maybe sort of