Since fuzzles are basically lab rats, I'm sure the vykkers have plenty of them and don't need to catch them because they could just breed more. The cages they are in are different than the scrab trap.
Because of the nature of the scrab trap, I assume it was used by oddworld hunters to catch scrabs to eat. The vykkers employ it to catch whatever they can or want to perform "scienctific" expirements on. The recorded sounds it makes (to attract Munch) and sonar pings could probably be changed to attract any oddoworldian creature, but most likely larger ones so that the trap wouldn't just kill them.
As for why it showed a fuzzle... probably because they are simple to animate?
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