potatoes

They look odd,I must say they don't look like potatoes to me, or tomatoes .They look to be hanging down like bunches of cherries.Sorry no idea cut one open and see what the inside looks like.

If the plant in the tub was a potato then these are the fruits of the plant. they are very very poisonous and should be removed and disposed of. Indeed the fruits of all members of the Solanacea family, except for Tomatoes (and a few otherrs, less well know) are poisonous.

Yes, agree with Owdboggy. They are the seed pods of the potatoes and as he says very poisonous. Cut them off and put them in the compost heap or bin.