Both are informal words meaning father. It is interesting that I couldn't find a similar word in other Germanic and Latin languages. It looks that this word has directly migrated from central asia to british isles !
In Turkish father is baba. Maybe Turkish spoken in Cappadocia has dadas (not sure), which is a native Anatolian word (attested also in Cappadocian Greek). Turkish dede however means grandfather. Generally local dialects might have picked up native Anatolian words such as Lydian taada, Luwian tatta and Carian ted. Those extinct languages are all Indo-European.
In any case all those words are lallnamen (baby speech), which goes beyond the limits of language groups and are far older than Indo-European and Altaic.
In Turkish father is Baba, but rest of other Turkic languages is Ata. Well, according to your logic a word for dad is father. Lol, so c'mon guy. In every Turkic language Dad is usefull, even we Turkic peoples have ancient saga called "Dədə Qorqud" means Dad Gorgud. As well as in Azerbaijani Nənə for Nan/Grandma, in middle Turkic using Bitik for Book, Beyin for brain, Söyle(mek) for To Say, Yer for Earth, Ertä for Early, Boɣ/Boɣča for Box, But (in Altai Turkic) for Foot, Kuday/Kut for God/Got, Dön/Tön for Turn and etc. etc. Do you wanna more?