What brand makes smallest tampons?
When you say ‘small' do you mean the thin / thickness of the tampon or the shape of the tampon?
I think every BRAND has little to thick tampons...Not sure what they call the tampon sizes in your country, but we have mini, regular and super in Australia.
Mini - for the days you are only spotting but with no blood flow
Regular - first day or the last day when your period isn't very heavy
Super - the 2nd or 3rd days when your period are the heaviest
Just be mindful, the thicker and larger the tampon absorption, the higher the possibility of Toxic Shock Syndrome (TSS).
O.B. has the smallest ones.