In the front cover of my chemical first album does it have words merci pour le venin meaning thank you for venom which is a song off their 2nd album?

No, the front cover of My Chemical Romance's first album, "I Brought You My Bullets, You Brought Me Your Love", does not feature the words "merci pour le venin". The phrase "merci pour le venin" is the title of a song on their second album, "Three Cheers for Sweet Revenge", not their first album.