John Fisher was the son of William Fisher and they entered a mark together, as plate-workers on 16^th August 1793. William & John Fisher then registered as spoon-makers in 1797. John entered his mark alone on 22^nd February 1799 as a small-worker.

There are three possible makers, around this time, that could have made these sugar tongs. As with many of these makers with the same initials you can never really be certain who the maker is.

John Fountain was registered as a plate-worker and whilst being a plate-worker does not rule him out of making sugar tongs, it does make it less likely

John Fuller entered a mark as a small-worker in 1804. These tongs could well be his, but I have no idea whether he actually made sugar tongs

John Fisher - Did enter a mark with his father, and there are several examples of sugar tongs by John & William Fisher - so they clearly made sugar tongs when they were together.