Frantically-Franticly | Commonly Confused Words

Frantically

/ˈfræntɪk(ə)li /

In a hurried and disorganized way, usually due to panic or urgency

He searched frantically for his lost keys.Her eyes darted around the room frantically.They waved frantically for help on the beach.

When someone does something rapidly and with nervous energy due to panic.

She searched franticly for her misplaced keys.The dog ran franticly in circles in the yard.He waved his arms franticly to signal for help.

Frantically is the more commonly used spelling in modern English.
Franticly is an older form and now less common.
Both words function as adverbs, meaning they describe the manner in which an action is performed.