Is it possible to both block with Daemogoth Titan and sac him to Tend the Pests after he is declared as a blocker without having to sac another creature? In essence, would Daemogoth Titan satisfy the sac demand for both cards so the opponents attacking creature is still blocked, but you also get to use Tend the Pests, using Daemogoth Titan as the sac creature to satisfy the sac demand of Tend the Pests?
Read the card, the Titan demands the sacrifice of a creature, not of the Titan specifically. When the trigger resolves, you have to sacrifice a creature from among those you control. Luckily, if Tend the Pests is cast in response to the trigger, you'll have a bunch of Pest tokens to sacrifce, so just sac one of those. Still 10 left afterwards.
Former Rules Advisor
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