Axalotls and glow squids can spawn in the frozen river biome and they probably aren’t supposed to do that.
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We're tracking this issue in MCPE-130635, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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This is probably working as intended due to the resolution of MC-222302.