Trying to find the name of a kids picture book I used to read.  It was between 1985 to 1995; it was an action book bout a hero or heroes fighting against a green monster.  The only thing I remember about one of the books is the heroes chase the green monster, with two orange tentacles things from his mouth, into the water and the book said “to be continued.”

If you can find what those books are called I’d be so happy.