These are modular origami models which create a one-dimensional structure (as opposed to quilts, which are two-dimensional). Such models can usually be extended to arbitrarily large numbers of units. By connecting the two ends, a chain can be transformed into a closed ring, but structurally I treat this as just a variant of the same model.
I haven’t seen any specific name used for such structures so far, so I introduced my own, origami chains.
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