The witch could see Damon wasn't enjoying being a frog. She hasn't found a way to change him back.
He barely ate any bugs, or flies, only if he was desperate and hungry. Thr witch will change him into something else while she finds a counter spell.
She opens up the Terrarium and picks up the small cute frog as she place him on the ground as she looks at Damon.
"Looks like you don't like being a frog." Damon could only croak in response. "I haven't found a counter spell yet. But I can change you into something else. I know what to turn you into."
She then wave her wand as a puff of smoje surrounds Damon. He grown bigger and fur grows around his body as he had hooves for hands and feet.
The witch could hear a neigh as a handsome stallion stood where a green frog use to be.
"There. A better form for you." Damon looks over his new form and admits he does like being a horse then a frog.
After the spell was done. The witch takes Damon out of her house and into a stable that will be his new home.
"There a better home for you. I'll make sure your feed and taken care of while I look for a counter spell."
The witch then left the stables.