שִׁ֤ירוּ לוֹ֙ זַמְּרוּ־ל֔וֹ שִׂ֖יחוּ בְּכָל־נִפְלְאֹתָֽיו׃
Sing unto Him, sing praises unto Him; Speak ye of all His marvellous works.
Metzudat Zion
speak as in diveri hayamin 1:16:9 speak about all of His miracles.
Rabbeinu Bahya
When Moses prayed that the frogs should remain only in the river (8,8) a certain insect called altamseh remained; this insect multiplies from time to time and infests the land areas of Egypt. It is reported to sometimes swallow two human beings at one gulp. It is immune against spears and arrows and unless struck in its underbelly it cannot be killed. It is a sub-species of frogs. It was a remainder of Moses’ plague. However, due to Moses’ prayer now, not a single locust remained in Egypt that could breed there. This is how Rabbeinu Chananel explains this, and is a reflection of the verse in Chronicles I 16,9 “speak of all His wondrous acts.”