Scotch tape gun is basically a heavy-duty packaging tape dispenser.
The dispenser holds a roll of tape and comes with a hand brake mechanism for ease of control. You can reuse the dispensers by replacing the empty rolls with scotch tape refills.
There are 4 different versions of tape dispensers available on the market-
Handheld Tabletop Automated Water-activated dispensers.
Among these kinds, handheld versions are often referred to as “Tape Gun”.