I forgot if it had a name. I think it is simply called by his own name, Chiddushei Rebbe Eliezer Ashkenazi. It wasn’t around forever. It is missing a certain part were he writes that he had to run away (or something like that).
In his Maase Hashem, I saw yesterday that he has an interesting approach in the Rambam on the topic of seeing a Malach in a Chalom. He addresses the Ramban’s Kashos on the Rambam.
He explains that the Chalom in these circumstances mean a state of blurriness, in which anything goes, so that the Navi shouldn’t be shocked when he hears a Malach speak. The same is by Bilam’s donkey. He wasn’t too shocked to answer because he was in this state.
I liked this approach, especially since it answers the apparent Stira in the Rambam. On the hand, the widely-quoted Rambam says that Bilam’s donkey speaking was part of a dream. On the other hand, and not as widely-quoted, he writes that a Malach was needed to make the donkey speak. Also in the Pirush Mishnayos on Avos, where it says that the Pi Ha’ason was created Erev Shabbos, he explains that it was a Ness.