[quote=@Guardian Angel Haruki]
Alright then...

I would say it is possible for Jub to Enlarge/Reduce on Brutrumukk. Since Brutrumukk is now a small sized creature (being a gnome now), he will become Tiny. That will be an action.

Picking up Brutrumukk, if he's willing, I will rule that part as Free Action: Object Interaction. 

Now for the difficult part: Escaping. 

Disengaging requires an action, and since Jub would have already used his action for the spell...
His escape will cause the three Bullywug Knights to take Attacks of Opportunity. Jub can summon the wings if he wants, but that's not going to help protect him from the AoOs. And remember, the charm has a limited amount of uses before it can't be used again...
[/quote]

Wait, hold the phone.

Jub has Nimble Escape (I know he's never used it until now because oops) so he can take Disengage as a Bonus Action.