1) A Bullfrog, where the frog's body is actually a mix of the bodies of a frog and a bullfrog.
2) A psychedelic frog from whose back eyes emerge and then hover in the air. This concept recalled the hallucinogenic effects of some frogs.
3) a classic barber shop where the characters are frogs. This version paid homage to underground American comics and in particular Vaughn Bodé.
The selected idea by the client was number 1. Here the concept was developed in more detail arriving at the following definitive rough.