What potential H2O bio-equivalents would (critically) also float when frozen?

Because water ice is less dense as a liquid than a solid (as an aside - this is due to the basic structure of the oxygen atom) it floats when frozen. Without this property ice would sink, basically filling up every ocean and lake from the bottom up. In any biosphere, a basic solvent is required, which is water on Earth. What other solvent in another "bio-mix" (for example, a methane-ethane atmosphere) would also possess that seemingly critical property of floating when frozen?

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What potential H2O bio-equivalents would (critically) also float when frozen?

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