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Generally you can only bet on either heads or tails, and continue tossing up until you get a result.
Source: https://www.9news.com.au/national/two-up-guide-anzac-day-guide/092e05c4-784d-44f9-b4c0-f10255fd63e2
Roughly three minutes before the start of the game, the referee asks the designated team to choose heads or tails, and the referee will confirm the call mid-toss.
Source: https://fansided.com/2023/02/07/super-bowl-coin-toss-history-results-process-betting/