Yes! Trail Mixer multi-packs are fully legal in Iowa. Each Trail Mixer is its own container and meets Iowa's requirements for multi-pack consumable hemp products.
From Iowa HHS FAQs:
Yes, packages of multiple consumable hemp products, such as a 4-pack of canned beverages or a 10-pack of gummies, are allowable if per serving and per container restrictions are followed. Each product within the multipack must be labeled as its own container, with all packaging and labeling requirements met, including the CoA QR code, nutrition information, and warning label.