It’s FITNESS!
A: Hili, look—our neighbour has sent us a photo.
Hili: The one on the right is probably Tyrannosaurus rex, but what is the other monster?
Ja: Hili, popatrz, sąsiadka przysłała nam zdjęcie.
Hil: Ten po prawej to chyba Tyrannosaurus rex, a ten drugi potwór to kto?
(Photo by: Małgorzata Dwórznik)

Fitness is much maligned 🙂
Fitness definitely looks like he’s on the side of Basement Cat. I like him.
What other monster? I just see a photo of a T-Rex toy. Or maybe there’s a nightjar in this photo…?
b&
Arms on the tyrannosauriform monster look a bit robust for a T.rex – Edmontosaurus, perhaps?
Ed‘s a hadrosaur, so I don’t think so. Dinosaur toys with two manual digits must always be intended to represent Tyrannosaurus, it’s a rule.