Are there any "design patterns" in C?

Design Patterns could be viewed as missing language features. The Introduction of Design Patterns: Elements of Reusable Object-Oriented Software states:

The choice of programming language is important because it influences one's point of view. Our patterns assume Smalltalk/C++-level language features, and that choice determines what can and cannot be implemented easily. If we assumed procedural languages, we might have included design patterns called "Inheritance," "Encapsulation," and "Polymorphism." Similarly, some of our patterns are supported directly by the less common object-oriented languages. CLOS has multi-methods, for example, which lessen the need for a pattern such as Visitor. (italics mine)

The sentence in italics is the answer to your question.

My favorite is the "Patterns in C" series by Adam Tornhill:

• First-Class ADT
• State
• Strategy
• Observer
• Reactor

Also: I always think of goto as a great poor man's tool for the decorator pattern.

Update: I'd highly recommend using Rust (rust-lang.org) rather than C except where you are required to use c. Rust has all of the benefits of c, including speed and binary library compatibility with c, but the compiler handles much of the complexity to ensure that the code is memory safe and does not contain data races. It's also portable, has a standard library for common tasks, and much easier to program with for various design patterns.