They need to add a frog mob that will spawn in swamp biome, some water biomes and rarely spawn in caves.
The mob is passive until attacked by the player and will do around 1.5 hearts per hit with no armour on.
The drops could be slime, leaves and feathers and maybe a new item called "frog legs" which could be eaten and do the same thing as raw chicken. The legs could be added to soup or just cooked to be a better food source.
The frog would be the height of the plays legs or perhaps up to the waist and would be available in different colours such as green red and blue. They might even be able to shoot poison in the same way that the llama spits.