To Spawn a frog use the Spawn egg that can be get from the Items Sign
PLEASE NOTE: Spawning Multiple Frogs can be glitchy. To prevent this, Do not spawn Frogs near each other spawn them 4 blocks away from each other. Also prevent them to be near each other.
To kill the frog is simple just kill it originally like mobs/players. Frogs drop "Frogs skin"
You can also craft a Frog foot. Just drop a Frog skin and a leather boots
When you wear the Frog foot you will be given Jump boost