If you have Sheep Tokens from Scapegoat and in the next turn activate Non Spellcasting Area can the tokens be tributed for a Tribute Summon

No. The "Scapegoat" card states that the tokens cannot be used for a tribute summon and there is no getting around that. Besides, "Non-Spellcasting Area" only states that monsters would be immune to Spells; nothing to do with Tribute Summoning. (Just an extra note, if the "Sheep Tokens" are Tributed for something other than a Tribute Summon, that's okay.)