Bitcoin (BTC)
The first cryptocurrency. Bitcoin itself cannot be frozen in a wallet, but it can be traced to exchanges that can.
How it works
Bitcoin payments spend earlier payments and create new ones, often with "change" going back to the sender. That makes trails branch, but they stay public.
How traceable it is
Fully, unless the coins go through a mixer. No company can freeze bitcoin in a private wallet, so the goal is to spot when it reaches an exchange.