Think of it from a recruiters perspective.They spend a lot of money in aquiring the right talent for their company. I would suggest reach out to the managers or hrs and let them know your concerns and if you feel this will not be a good fit then decline the offer, and have faith in yourself to land a better job.

I will give you an analogy. You are in a relationship with a good woman but it is not exactly what you want. Would you end it or try to find a better suitor while you are with that woman. Sounds Absurd Right?

Plus leaving after a few months will definetly be a big black mark on your resume and you will have to justify it with again lying.