I've never actually seen cecotrope in real life - that could be what it is. Normally you don't see it because the rabbits eat it right away. If you do see it, I think it can mean that the rabbits diet is to rich. Reduce the amounts of greens, pellets, and treats and feed more hay. Remember that hay should make up most of the rabbits diet.
What are you feeding him now, and what was he fed before you got him? I would feed him only lots of hay, and slowly introduce pellets and greens. Something your feeding him could be new to him and could be causing problems.
Are all his poops like that, or just some?
I would keep an eye on his eating. If he's not eating enough he could have problems, such as digestion issues, or even teeth issues.
Remember that rabbits not eating or pooping for a day (12 hours) is an emergency situation. If he doesn't start drinking more (especially if it's hot where you are), or stops eating or pooping altogether, get him to a vet ASAP. You don't want him to get dehydrated or go into GI stasis.
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