Wills and Mrs. Pteranodon

Now, I have no idea where he got this, but Wills has been calling Jules "Mrs. Pteranodon" all the time lately. Could it be because of the show "Dinosaur Train"? Or because of his absolute favorite puzzle, the dinosaur one that Jax gave him? Regardless, it is really funny and kind of weird :) I guess this name is better than other names he could be calling her. And there is no doubt, he says it with lots of affection.