Because “d” and “t” are so close in sound, some irregular verbs were merged in people's speech. For instance, “splitted,” but the grammatically correct word for split past tense form is “split.” Irregular verbs generally don't form their simple past tense or past participle by adding “-d” or “-ed” to their stem word.

Are splitted or are split?

No, splitted should never be used. The past tense and past participle of split is simply split. Say split.

Is there such a word as splitted?

(nonstandard or archaic) Simple past tense and past participle of split.