Can you pay the Accelerate cost when a unit enters the battlefield without being played from hand for mana (e.g., through Baited Hook activation)?

Ruling: No, you cannot pay the Accelerate cost. Accelerate allows you to pay the additional cost when you play the unit ignoring cost, but "ignoring cost" only ignores the base cost, not the Accelerate cost.

Nuances:

• Accelerate specifically requires playing the unit from hand
• Effects that put units into play "ignoring cost" only ignore the base mana cost, not additional costs like Accelerate