Sure; you can roll your own, or you can use one of the many other libraries that provide alternatives. There are obvious downsides to the former, and the latter is basically equivalent to using the Abseil ones in terms of practical tradeoffs.
Chromium uses hundreds of other open source libraries. Is there something about Abseil specifically that sticks in your craw?
https://stackoverflow.com/a/42588384/1593077
But you can and should use non-std state-of-the-art hashmaps without living in the world of abseil.