Is Bitcoin a token?
There is no clear definition of token, the term.
From general public understanding, yes, bitcoin is a token.
From blockchain / crypto industry, tokens usually are referred to “something with value” built on a public chain or smart contract, such as ERC20 tokens (Ethereum based). Bitcoin is bitcoin, other copycats of bitcoin are called “alt-coins”
From regulators view, In USA for example, IRS thinks both bitcoins and tokens are virtual currencies or assets. FINCEN thinks bitcoin and tokens are currencies or money. SEC / CFTC thinks bitcoin is commodity while tokens could be securities.