BunBun's head looks a bit more like a Mini Lop than a Holland Lop, and his size is more in the range of the Mini (for show purposes, Mini Lops are supposed to weigh between 4 1/2 and 6 1/2 pounds). That said, the Holland Lop employs the dwarfing gene, and without it, you certainly do get animals well over the 4 lb maximum showable weight for the Holland, so I can't totally rule out a false dwarf Holland from a breeder who wasn't particularly focused on showing. It's also possible that BunBun could be a Holland/Mini cross. He has a very pronounced crown, even though he's a bit narrow across the back of the head (the reason his ears don't hang straight down on either side of his face) and appears to have a bit of ear control - which could also be the result of someone not knowing or caring about the breed standard when choosing their breeding animals . A lot of people use the term "Mini Lop" to refer to almost any rabbit with ears that don't go up, but I think BunBun has more of a right than that to be called by that name. Or, you can just call him "cute" and not worry about the breed.
(BTW, his color is called "Ruby-eyed White" [REW] in the Holland Lop, and simply "White" in the Mini Lop standard. Go figure.)
(BTW, his color is called "Ruby-eyed White" [REW] in the Holland Lop, and simply "White" in the Mini Lop standard. Go figure.)