When a land becomes a creature, that doesnâ€™t count as having a creature enter the battlefield. The permanent was already on the battlefield; it only changed its types. Abilities that trigger whenever a creature enters the battlefield wonâ€™t trigger.
A land that becomes a creature may be affected by â€œsummoning sickness.â€ You canâ€™t attack with it or use any of its abilities (including its mana abilities) unless it began your most recent turn on the battlefield under your control. Note that summoning sickness cares about when that permanent came under your control, not when it became a creature.
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