Minnow is a six letter word meaning small fish.
Fishes
oyster
gerbil
capon
Morsel
nibble
One word I can think of is bedsit. Another is studio.Both are small-roomed residences.
There are three fish capable of leaping, all three are food, but only one has 6 letters.The word is salmon
Titbit: also tidbit: small amountTomtit: a small bird.
Anthem is a six letter word ending with them.
A six letter word for 'snake' is python.
The only 6 letter word ending in 'heh' is Akcheh, which is a small Turkish coin.