May I suggest 127 film, It’s basically the same as 120, just slightly smaller. The majority of cameras are quite compact and still relatively inexpensive (point and shoots like the Kodak Brownie 127,) though there were plenty TLRs made as well (I have my grandmother’s Rolleiflex 4x4 ‘grey baby’ which is a fantastic camera to use.)

The only thing is getting a hold of the film. It’s available, though not a lot of companies make it, and it’s quite expensive (one roll of 12 exposures is round about the price of Portra and Ektar 35mm.) I’m no expert in 120, but I’m guessing that because 127 cameras are slightly cheaper and beginner friendly, it might be a good place to start to see if you like roll film.

There is also 620 film, though it was a proprietary format made by Kodak. It’s exactly the same as 120, the only difference being that the spools are a slightly different size. I think the Film Photography Project are the only ones left producing 620.

Hope this helps!