Board Thread:Site-Related Tasks (NEW!)/@comment-1713281-20151201050946/@comment-11836-20151203000154

According to Marvel Appendix, Marvel Monsters: Fin Fang Four Vol 1 1 mentions Gruto. Just a mention of a past confrontation with the Fantastic Four.

A Roc appears in Hulk and the Agents of S.M.A.S.H. Season 1 24 and the species appeared in Fantastic 4th Voyage of Sinbad Vol 1 1, although that case doesn't confirm pre-FF appearances. (Marvel Appendix just includes all appearances for completions sake.)