Boarboyz? Wow, that takes me back!
The short answer is "no." There are no existing rules for Boarboyz as I recall, and GW seems to politely pretend they were never a thing.
The long answer is "maybe." You might be able to proxy them as something--Stormboyz, maybe, or perhaps bikes (though they don't have the guns).
The last option would be to write up your own custom datasheet for them and see if people let you use them. Boarboyz used to move pretty fast and have a nasty charge. I'd probably give them a boosted toughness, the same terrible ork save, 2 wounds, and maybe a 12" move or something. Let them get a +1 Str on the charge or so and give them all +1 attack (for the boar). Can't see too many people complaining about that.