No you can’t. Just use one of the regular local trains.

In the past you could by paying a surcharge (about the diff of what this train cost vs the only 1/hour normal train-I think to/fro Gj/ovik). So just ask at counter in case you will not want to wait that long.

Local trains every 30 mins. Check on VY website. These are not the trains to Gjorvik. 

You didn’t say when you are travelling but there are numerous changes to trains all over Norway at the present time due to engineering work. I should know I’m in Norway now and have been for the last two weeks. Do not use the  RailPlanner app it is incorrect. Use the SJ Nord app or the VY app as they are updated daily. Some trains require reservations which you can get by ringing Entur. The sleeper to Bodo has been cancelled with no alternative arrangements