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[Tt112233]

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[Accname]

Nope, but:

You can play around with the action

Unit - Suspend unit corpse decay

to make the decay longer for certain units but i can imagine this would be a real pain.
You can only use this action after the death animation of the unit has finished (and there is no way to find out with triggers when this has happened) and you would have to somehow reactivate the corpse decay after a certain period of time.

A sample trigger to increase corpse decay time for units of type SOME_TYPE might look like this:

Events
 A unit dies
Conditions
 Unit type of (Triggering unit) == SOME_TYPE
Actions
 wait 5.00 seconds of game time
 unit - suspend corpse decay for (Triggering unit)
 wait 20.00 seconds of game time
 unit - activate corpse decay for (Triggering unit)

Problem is, you have to make sure the death animation for units of SOME_TYPE is over after 5 seconds.

 

[Owner123]

Not for specific units, however the decay speed of all units can be edited through gameplay constants.