The Grumblebug is a Petpetpet (a pet for your Petpet).

This little bug makes a grumbling sound. Many Petpets get scolded when they have a Grumblebug.

You can buy this Petpetpet from the Shop Wizard for around 40,000NP.

There is one item associated with this Petpetpet; "Grumblebug Water Bowl".

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