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All video cards of recent memory provide dedicated video RAM. Integrated video, on a motherboard or embedded system may or may not provide dedicated video RAM. It's a design choice.
There have been stand-alone video cards and boards with integrated video that allowed adding video RAM via some kind of daughterboard. (custom, DIMM, whatever). It either allowed getting away from shared system memory or augmented a smaller amount of dedicated video RAM. You won't find many surviving examples, and I wouldn't go shopping for one. You could consider SLI to be an exception. A pair of SLI video cards could use each others memory, though sharing between for other than inter process communication would not be as efficient as each using their on-board memory.
That's all academic. Where laptops are concerned the option doesn't exist. Even those brute Clevo laptops (aka Alien/Falcon/voodoo) use a single PCIe video card, so no chance of adding to their existing measley 256MB.
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