Buses are there but their number and frequency are less. Not sure about the bus number for Dankuni-Ballygunge sector, for Dankuni-New Town sector, it's C23 (Dankuni-Park Circus).
So if you are considering road transport from Dankuni, then connectivity is there but it's not like Howrah or Santragachhi and it's natural also as it was just a mere suburban station earlier. I am hoping within one year, the raod connectivity is going to improve for Dankuni