can i giveaway games on Lootboy here

can i put a giveaway here from lootboy if i don't want a steam key one or make a giveaway

As long as it's a steam key. Yes ofc 👍

Yes you can make a giveaway for a key that you got on Lootboy,as long as it's a Steam key(sometimes you get GOG or itch.io keys).
Be aware that sometimes Lootboy can give you an already used key,so put a warning in the giveaway description.

Yep, you can as long as it is a steam key. There is even a steam group for giving away lootboy keys.