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The phrase "are sometimes called" is correct and usable in written English.
It can be used when introducing an alternative name or term for something that is not always referred to by that name.
Example: "These animals, which are sometimes called 'sea cows,' are actually known as manatees."
Alternatives: "are occasionally referred to as" or "are often named".
Exact(58)
These are sometimes called protosignals.
(Fruit flies are sometimes called vinegar flies).
These tiny masses are sometimes called "incidentalomas".
Caryatids are sometimes called korai ("maidens").
Such systems are sometimes called smart pedals.
(Its pickups are sometimes called "mudbuckers").
Scripting languages are sometimes called little languages.
Such regions are sometimes called amplicons.
These are sometimes called Vickrey auctions.
Similar(2)
Simple hog houses are sometimes called sties.
They are sometimes called "wet erase".
More suggestions(15)
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com