Hedgehog spikes really aren't as sharp as they look. They can be prickly at the ends and if you randomly touch it, but if it's a tame hedgehog, the quills will lay themselves down, so it won't hurt to pet or pick up a hedgehog.
Thorny devils' spikes are sharp.
foxes
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They have very sharp spikes and when there is danger they curl into a ball so only the spikes are shown and anything that tries to touch him will get spiked
Stegosaurus had a tail. It also had lots of sharp spikes on it.
Brine spikes are plants that live in freshwater biomes. They have adapted to include sharp spikes on their leaves to discourage animals from eating them.
The thorny devil's body is covered with sharp protuberances, or spikes.
I know this kinda babyish but, my friend calls them pricklys!
Sea Urchin !
The tail of a Stegosaurus wasn't sharp. However, it had two spikes that protruded from each side of the end of the tail. The two foot long spikes were called thagomizers, and with the force of the tail behind them, the thagomizers were capable of even injuring bone. They weren't sharp enough to cut you if you touched them, though.
Hedgehogs are usually asleep during the winter so are unable to survie.