A regular smaller oma? Here's an example:
Highlander omafiets 26 Inch Zwart
Hollandia Royal Dutch omafiets wit 26 inch

But they tend to combine the classic frame shape with wider aluminium tubing, fat tyres and often more colour for the smaller sizes:
https://en.hollandbikeshop.com/child...-3s-matt-gray/

The taller frames can be found in the women's bike section of the website above, but is often with 28" wheels. But I think a lot of seat tubes have gotten shorter relative to overall frame size compared to the classic oma, so the 'frame size' might be a bit misleading at first sight and I doubt the seat will go down in the seat tube fully. Would be nice though, a big height difference between saddle and handle bars is what makes omas nice, that gives them a leisurely king of the road feel. Extremely tall headtubes are also very popular among olditmer collectors.