Does anyone remember this toy?

Miscellaneous and Personal Stuff I Must Share
1

I think this goes in this forum - if not, I apologize, and would a mod please move it to the correct forum.

In the mid 60’s, there was a building toy made of a spongy, slightly sticky substance. The pieces came in various shapes and sizes, all brightly (for the 60s) colored. You mooshed the pieces together to build things. The toy was called Gux. The commercial’s tag was a voice saying “gu-gu-gu-gu-gu-gu-gu-gux” up the scale and back down again.
I am not imagining this toy. I distinctly remember begging my parents for it after a friend got it for her birthday. I also remember another kid at that party eating one of the pieces on a dare. Nothing happened to him, so I’m assuming the material was non-toxic.
Please, someone out there, besides me, has to remember it.

2

The science damned 3 letter search restriction is making things difficult, but it seems like it was mentioned in this old thread about odd toys.

i’m skimming over it even now to see if i’m remembering correctly …

3

The description (including the time frame) generally fits a toy we had, except the name was something like “Big Builders”. The pieces were typically arch-shaped, with little projections on the sides that hooked into the hollow “legs” of other pieces. Little bits of red, green, yellow, or blue foam were constantly being eroded away as the blocks were dropped, banged against things, or chewed. I wouldn’t be surprised if Gux was a knockoff of Big Builders, or vice versa.

4

I remember in the 90’s Nickelodeon made something called Floam.

5

wasn’t Floam more like Silly Putty in that it started as a mound of gunk you then shaped?
Gux was shapes you plunked together to buil things - like with Tinker Toys or Legos, but instead of being made of wood or plastic, Gux was made of the kind of spongy foam like material one finds in a pillow or cushion - and after playing with it, your hands were a little sticky.