Sure I remember them.
I borrowed a Baby Einstein exersaucer which had a recalled choking hazard toy. Found shreds of plastic in my baby's mouth. Hard to forget that!
We had board books and a huge book that unfolded into a little enclosure for a baby to sit inside and look at pictures. I found it on this Wiki.
https://the-true-baby-einstein.fandom.com/wiki/The_True_Baby_Einstein_Wiki
I think they started with Baby Mozart. A lot of the ideas were not scientifically valid. So that got out into the public.
I think the trend ran its course. In particular because the stuff was visually garish - loud colors, constant flipping of images, etc. Opposite end of the spectrum from the "sad beige baby" trend that is au courant now.