As intended, frogs slow down on soul sand, but they don't always show its walking animation while walking, and they can't properly move towards a player when tempted while standing on soul sand.
How to reproduce:
Create a flat area of soul sand
Summon a frog
Tempt it with a slimeball
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Comments 2
Thank you for your report!
We're tracking this issue in MC-251931, so this ticket is being resolved and linked as a duplicate.
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Same as MC-251931, just a different block; I suggest to merge the reports, as this is related to movement speed only, not the blocks.