The film is called Aztec Rex. I have never heard of it before but it is stunningly bad, and kind of wonderful. It tells the story of 16th Century Spanish Explorers in an uneasy alliance with Aztecs, against a rampaging Tyrannosaurus Rex.
Look out for it, it is worth seeing. Didn’t recognise many people, but Dichen Lachman is cute enough as the Aztec chief’s daughter and main love interest.