Not really. A "fiat currency" is generally defined as:
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Bitcoin is backed by a physical commodity; the electricity that was used to create it.
New Bitcoin is issued by the independent Miners who create it, not by any government or central authority.
The supply of Bitcoin cannot be directly managed by Gangster Government monetary policy.
Bitcoin cannot hyper-inflate because the supply is fixed. Only 21 million Bitcoin will ever exist.
However,
The Powers That Be are currently working very hard to co-opt Bitcoin and turn it into just another Central Bank Digital Currency for use in the Global Panopticon Perfected Slave Planet they are building.
Bitcoiners resist, but at the moment we are losing that war.