In ISO 3691.1 -2011 (actually under revision), chapter 4.12 states:
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4.12
Devices for towing
Trucks used for towing trailers shall be fitted with towing or coupling devices designed, constructed and arranged to reduce hazards of connection and disconnection and to prevent accidental disconnection during use.
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As you see the "trucks used for towing trailers" expression is used.
In other chapters of this ISO standard (6.3.1.3 for example) the requirements for Tractors are specified.
As a concluson - ISO considered towing application for forklifts as a kind of standard.
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