>>716455523It's a possibility, but not too likely.
It would either mean he carried them around everywhere, or they were in the closet at school before it became a dark fountain, and they're still there.
We do know that a lot of Kris and Ralsei's old toys got donated to the school, but something like that doesn't exactly seem like a toy. It's more like a memento, or something you'd put in a box to dig through for halloween costumes.
But if he's a plushie of Asriel, then that would make a bit more sense.
Kris could have thrown it in the closet out of frustration after Azzy left for college, or it could have been thrown in with a bunch of toys getting donated to the school, kind of like Andy did in Toy Story 3. (I still don't think that was all for nothing.)
Kris being upset at Asriel would explain a bit. like how he was seemingly apathetic to Ralsei for the first couple chapters, he kept his eyes closed when looking in Asriel's room in chapter 2. When he starts pointing out the differences between Ralsei and Asriel.