It's a 'tadpole'
Frog larva
tadpole, a frog's larva.
A tadpole
tadpoles
frog
frog
tadpoles
Yes, they have a tadpole stage, which is different in form and appearance than an older frog.
Larva simply means the younger form of a certain type of insect or bug. Depending on what type of larva it is, the larva will likely have a different type of diet.
Aquatic larva, terrestrial juvenile and adult. Tadpole, froglet (small frog with small tail) and adult frog.
No, Frogs lay eggs in water, which develop external to the female frog.
Frogs lay a mass of frog spawn in water.