Which dinosaur had nipples?

So my son was imitating a dinosaur and asking “what dinosaur am I?” He was upright, walking with large steps and had his arms tucked in with pointer fingers pointing forward. So I guessed T-Rex. He sighed and said “No Mom, these are not short arms. They are nipples.” He was dead serious, I of course was laughing my ass off. He began to get frustrated and said “I’m serious! I can’t remember the name of the dinosaur but it is big and walks like this and has long nipples!”

I have always encouraged the scientific questions of my children so was ready to explain that there were probably a lot with nipples cause they need them to feed their young. Then I remembered that no, that is how mammals feed their young and dinosaurs are reptiles. Then I remembered we were sitting in McDonalds and this probably wasn’t the place for a lively discussion on dinosaur nipples. So I changed the topic.

Now my brain is curious as to whether this is a real dinosaur and if it had nipples but I am afraid of what bizarre thing may appear from the depths of the Internet if I search “dinosaur with nipples”. So I shall ask you. Do any of y’all know what dinosaur had long nipples sticking out its front? Is there even one like that? I would consider this part of my sons imagination but he is almost always right when it comes to creatures I don’t know about.