I think I forgot to put my tongue back in my mouth.
I think my tongue is still hanging out.
この場合 I think から始めると良いでしょう。
ーI think I forgot to put my tongue back in my mouth.
「舌を口にしまい忘れちゃった」
to put my tongue back in my mouth で「口に舌をしまう」
ーI think my tongue is still hanging out.
「舌が出たままだ」
my tongue is still hanging out で「舌をまだ垂らしている」
ご参考まで!