Grime zombie variant for swamps

So, I've covered swamps before but I'd never have enough room for this idea! So here it is, the Grime. Grimes would spawn 2 blocks deep in muk. You can look at muk in my previous swamp ideas, I just didn't have enough room to fir the grime inside that idea. The grime takes advantage that the players goes deep in muk and goes slower. They will hide in muk, and when players go in them they strike! They'll drag the player into the muk, trying to suffocate them. They are quite fast in muk, but when on land they are slow. They going 8 blocks far from muk, they will attempt to go back. If they go in water, they slowly take damage and turn into normal zombies. On death, they drop 1-3 rotten flesh and 1-2 Muk Puddle. Muk Puddle can be placed, slowing down anything that goes on it. Muk Puddles can be placed, and despawns after 3 minutes and 30 seconds. That's my mob idea, and thank you for reading pal! Goodbye and have a fantastical and amazing day!