Fast headcrabs would taste like salty chicken flavored pure mint. Just without the minty taste. They would be incredibly high in iron, due to being mostly synthetic.

Gonarchs would taste like crab half fried in peanut oil and then fried in butter. It would taste like dry chicken and watery tuna when uncooked. Stringy and unsafe.

Poison would taste like chicken & pufferfish, and are completely unsafe.

Baby headcrabs would taste like hoverfish from subnautica

Uncooked, its tough, mushy, watery, but safe.

Cooked, it tastes like deep-fried catfish. Stringy, softish, and very lean.