common frog spawn ( rana temporaria ) 
 ,The common frog is one of only 2 native frog species in the UK (the rare pool frog being the second) ,common frog tadpoles are larger and lighter in colour than common toad tadpoles they are also faster swimmers and are more secretive hiding near the bottom as they aren't toxic like toad tadpoles and are eaten by many predators.
Common frog eggs are laid in clumps as opposed to toad spawn which is  laid  in long strands ,the tadpoles also get larger and are lighter in colour than toad tadpoles while they look similar after hatching , frog tadpoles turn a sandy brown color whereas toad tads stay dark black ,unlike toad tads which are usually seen in large groups swimming out in the open this is due to them being toxic and highly distasteful to ,fish ,birds and mammalian predators although newts will sometimes eat them and their toxins Don't deter insect predators at all  ,this is why toads prefer to breed in larger bodies of water with higher fish populations and less aquatic insects in contrast to frogs which prefer smaller water bodies with no fish ,as the frog tadpoles lack of toxins making them vulnerable to vertebrate predators like fish and birds , their higher speed and agility is enough for them to evade most insect predators.
Feeding 🐛
Tadpoles will eat a wide range of foods 
Fish foods like
Flake 
pellets
Algae wafers
Bloodworm pellets
Sturgeon pellet and most other flake or pelleted foods are good.
Frozen foods like
Bloodworm
Daphnia
Tubifex
Krill,
Gammarus
Mosquito larvae
Plankton 
Are all great for them , boiled cabbage is also a good choice
Tadpoles are also scavengers and will eat almost any organic matter found in the pond from dead fish and insects to algae ,detritus ,dead plants, fish waste and left over fish food.
Temperature: 🌡️
spawn and tadpoles can survive temperatures down to near freezing but optimal temperature for hatching and growth is between 15 - 22 °C