LOL 😆 I would take him to the vet to have them assess. Sometimes older buns will “suck” their testicles back up when nervous. At any rate sometimes it can take a while to get an appointment for neutering so might as well start the process.
He is very likely older than 1 month because they stay with their mom until 2 months. Hormonal behaviors usually start around 3-4 months, so I would say he’s at least that old. If you post a picture we may be able to take a guess.
I agree a stuffy is a good idea. When I volunteered at the shelter we had a number of stuffies that we would give to the unneutered buns so they could get out their frustrations, there was one shaped like a hedgehog that was particularly popular 😆
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.