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PA (Polyamide) is a semi-crystalline polymer. There are two types: those made of one basic material (e.g. PA 6) and those made of two basic materials (e.g. PA 66). They can occur both naturally (e.g. wool and silk) and synthetically (e.g. nylon).
But there are plenty of examples of non-biological (i.e. non-polypeptide) polymers made from amino acid monomers. Sodium poly(aspartate) is an important example of a non-polypeptide polyamide. So the answer is polyamides. Polypeptides are a specific type of polyamide and proteins are a specific type of polypeptide.