"Does the Bible say anything about dinosaurs roaming the earth?
First let me say I think they were incredible animals God created to show how powerful He was in a way we could see.
Actually the only reason today we tend to have a hard time believing in dinosaurs as God's creation is because just about every time we hear about dinosaurs, from when we are babies, we are told that they lived "millions of years ago." The Bible teaches that the earth is not millions of years old. If the earth is not millions of years old, then the dinosaurs are just another animal that God made on the fifth and sixth days of creation (the days when He made sea creatures and land animals)
Now for the fun part - Does the Bible say anything about dinosaurs? I believe it does in a few places. The clearest being in the book of Job. Remember that the word "dinosaur" was invented by a man in the early 1800's when the first iguanadon fossil was found. But there have been stories and pictures drawn of similar animals for all of human history - usually they were called "dragons."